validate null or empty media

lib/presentation/screens/actions/crop_status/sc_edit_action_crop_status.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                             executeTimeView = DateFormat("dd/MM/yyyy HH:mm")
                                 .format(executeTime);
                             //Show media
-                            if (_cropStatus.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _cropStatus.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/disease/sc_edit_action_disease.dart

                             executeTimeView = DateFormat("dd/MM/yyyy HH:mm")
                                 .format(executeTime);
                             //Show media
-                            if (_disease.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _disease.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/dung/sc_edit_action_dung.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                       DateFormat("dd/MM/yyyy HH:mm")
                                           .format(executeTime);
                                   //Show media
-                                  if (_dung.media.isNotEmpty) {
+                                  if (Validators.stringNotNullOrEmpty(
+                                      _dung.media)) {
                                     BlocProvider.of<MediaHelperBloc>(context)
                                         .add(ChangeListMedia(
                                             items: UtilAction

lib/presentation/screens/actions/end/sc_edit_action_end.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_end.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(_end.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/environment_update/sc_edit_action_environment_update.dart

                             executeTimeView = DateFormat("dd/MM/yyyy HH:mm")
                                 .format(executeTime);
                             //Show media
-                            if (_environment.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _environment.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/harvest/sc_edit_action_harvest.dart

                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_harvest.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _harvest.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/harvest_process/sc_edit_action_harvest_process.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_harvestProcess.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _harvestProcess.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/nursery/sc_edit_action_nursery.dart

                                       DateFormat("dd/MM/yyyy HH:mm")
                                           .format(executeTime);
                                   //Show media
-                                  if (_nursery.media.isNotEmpty) {
+                                  if (Validators.stringNotNullOrEmpty(
+                                      _nursery.media)) {
                                     BlocProvider.of<MediaHelperBloc>(context)
                                         .add(ChangeListMedia(
                                             items: UtilAction

lib/presentation/screens/actions/other/sc_edit_action_other.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_other.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(_other.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/packing/sc_edit_action_packing.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_packing.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _packing.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/plant/sc_edit_action_plant.dart

                                       DateFormat("dd/MM/yyyy HH:mm")
                                           .format(executeTime);
                                   //Show media
-                                  if (_plant.media.isNotEmpty) {
+                                  if (Validators.stringNotNullOrEmpty(
+                                      _plant.media)) {
                                     BlocProvider.of<MediaHelperBloc>(context)
                                         .add(ChangeListMedia(
                                             items: UtilAction

lib/presentation/screens/actions/sell/sc_edit_action_sell.dart

                                   .format(executeTime);
                             } catch (_) {}
                             //Show media
-                            if (_sell.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(_sell.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(

lib/presentation/screens/actions/spraying/sc_edit_action_spraying.dart

 import 'package:farm_tpf/utils/const_string.dart';
 import 'package:farm_tpf/utils/const_style.dart';
 import 'package:farm_tpf/utils/pref.dart';
+import 'package:farm_tpf/utils/validators.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
                                   } catch (_) {}
 
                                   //Show media
-                                  if (_spraying.media.isNotEmpty) {
+                                  if (Validators.stringNotNullOrEmpty(
+                                      _spraying.media)) {
                                     BlocProvider.of<MediaHelperBloc>(context)
                                         .add(ChangeListMedia(
                                             items: UtilAction

lib/presentation/screens/actions/use_water/sc_edit_action_user_water.dart

                                 .initWithSelectedByName(_useWater.waterType);
 
                             //Show media
-                            if (_useWater.media.isNotEmpty) {
+                            if (Validators.stringNotNullOrEmpty(
+                                _useWater.media)) {
                               BlocProvider.of<MediaHelperBloc>(context).add(
                                   ChangeListMedia(
                                       items: UtilAction.convertFilePathToMedia(