切换就餐模式计算打包费

src/main/java/com/chaozhanggui/system/cashierservice/service/CartService.java

@@ -1602,6 +1602,10 @@ public class CartService {
             cashierCartList = mpCashierCartMapper.selectList(queryWrapper);
 
             // 计算打包费
+            if (cashierCartList.isEmpty()) {
+                return new ArrayList<>();
+            }
+
             List<String> productIds = cashierCartList.stream().map(TbCashierCart::getProductId).collect(Collectors.toList());
             Map<Integer, TbProduct> productMap = productMapper.selectByIds(productIds).stream()
                     .collect(Collectors.toMap(