cleanup code

lib/pages/discount/discount_list.dart

@@ -2,7 +2,6 @@ import 'package:fcs/helpers/theme.dart';
 import 'package:fcs/localization/app_translations.dart';
 import 'package:fcs/pages/discount/discount_list_row.dart';
 import 'package:fcs/pages/discount/model/discount_model.dart';
-import 'package:fcs/pages/main/util.dart';
 import 'package:fcs/pages/widgets/local_popup_menu_button.dart';
 import 'package:fcs/pages/widgets/local_popupmenu.dart';
 import 'package:fcs/pages/widgets/local_text.dart';

lib/pages/discount/discount_list_row.dart

@@ -1,9 +1,5 @@
-import 'package:fcs/domain/entities/carton.dart';
 import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/helpers/theme.dart';
-import 'package:fcs/pages/discount/discount_editor.dart';
-import 'package:fcs/pages/main/util.dart';
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_vector_icons/flutter_vector_icons.dart';
 import 'package:intl/intl.dart';

lib/pages/discount/model/discount_model.dart

@@ -59,7 +59,7 @@ class DiscountModel extends BaseModel {
     }
   }
 
-  Paginator _getUsed() {
+  Paginator? _getUsed() {
     if (user == null || !user!.hasFcsShipments()) throw "No Privilege";
 
     var pageQuery = FirebaseFirestore.instance