修复account空指针问题

shopping-cart-application-service/src/main/java/cn/freemud/service/impl/ShoppingCartNewServiceImpl.java

@@ -1535,6 +1535,7 @@ public class ShoppingCartNewServiceImpl implements ShoppingCartNewService {
                 String finalCouponCode = couponCode;
                 List<ActivityCalculationDiscountRequestDto.CalculationDiscountCoupon> collect = coupons.stream().filter(calculationDiscountCoupon -> Objects.equals(calculationDiscountCoupon.getCode(), finalCouponCode)).collect(toList());
                 // canUseCoupon 0 表示可用
+                accountFlag = accountFlag == null ? 0 : accountFlag;
                 if (CollectionUtils.isEmpty(collect)) {
                     if (GoodsTypeEnum.BUY_M_SEND_N_COUPON.getGoodsType().equals(cartGoods.getGoodsType()) && accountFlag == 1 )
                     {