设置到付，isDispatchFree为空判断

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

@@ -987,7 +987,7 @@ public class ShoppingCartMallServiceImpl implements ShoppingCartNewService {
             throw new ServiceException(ResponseResult.SHOPPING_CART_QUERY_DELIVERY_TEMPLATE_ERR);
         }
         Boolean isDispatchFree = queryDeliveryTemplateResponseVo.getData().getIsDispatchFree();
-        if(!isDispatchFree) {
+        if(isDispatchFree != null && !isDispatchFree) {
             deliveryAmount = Long.valueOf(null == queryDeliveryTemplateResponseVo.getData().getFreight() ? 0 : queryDeliveryTemplateResponseVo.getData().getFreight() );
         }
         //邮费付款方式 DeliveryTemplateCostTypeEnum