fix bug

controllers/goods/order.go

@@ -109,6 +109,10 @@ func (c *GoodsController) PostOrder() {
 
 	// 订单优惠券
 	customercouponid := c.GetString("customercouponid")
+	if customercouponid == "undefined" {
+		customercouponid = ""
+	}
+
 	//
 	var orderInfo model.TaGoodsOrders
 	var orderDetail []model.TaGoodsOrdersDetail