create action with activity simple

lib/presentation/screens/actions/sc_action.dart

@@ -86,10 +86,14 @@ class _ActionScreenState extends State<ActionScreen> {
         //Create request general model
         _requestActivity
           ..tbActivityTypeId = widget.idAction
-          ..tbCropId = widget.cropId
-          ..externalTable =
-              _actionUIForm?.activityExtendTypeDTOList?.first?.externalTable ??
-                  '';
+          ..tbCropId = widget.cropId;
+        if (_actionUIForm.activityExtendTypeDTOList.isNotEmpty) {
+          _requestActivity
+            ..externalTable = _actionUIForm
+                    ?.activityExtendTypeDTOList?.first?.externalTable ??
+                '';
+        }
+
         filePaths = Get.find<ChangeFileController>().newFiles;
         textFieldControllers.forEach((key, value) {
           print(textFieldControllers[key].text);