feat:消费机支付卡顿的问题

lib/common/api/wallet_api.dart

@@ -1,15 +1,21 @@
 import 'package:pj_supermarket_cloud/common/index.dart';
+import 'package:dio/dio.dart' as dio;
 
 abstract class WalletApi {
   /// 优惠列表
-  static Future<List<DiscountsItem>?> getDiscountsListByUserId(
+  static Future<List<DiscountsItem>> getDiscountsListByUserId(
     dynamic params,
   ) async {
     final res = await HttpManage().dio.get(
           "/wallet/wallet-setting/ad/get-discounts-list",
           queryParameters: params,
+          options: dio.Options(
+            extra: {HttpManage.rejectBusinessErrorKey: true},
+          ),
         );
-    if (res.data == null) return null;
+    if (res.data is! List) {
+      throw const FormatException('优惠列表返回格式异常，请重试');
+    }
     return (res.data as List).map((e) => DiscountsItem.fromJson(e)).toList();
   }