fix(edit_cat): handle missing original data

- Prevents update with no original data
- Displays error message

Author: fulleni

lib/content_management/bloc/edit_category/edit_category_bloc.dart

@@ -107,7 +107,6 @@ class EditCategoryBloc extends Bloc<EditCategoryEvent, EditCategoryState> {
       emit(
         state.copyWith(
           status: EditCategoryStatus.failure,
-          // TODO(l10n): Localize this message.
           errorMessage: 'Cannot update: Original category data not loaded.',
         ),
       );