取消订单规则更改

go/gopath/src/fohow.com/apps/models/order_model/order.go

@@ -165,7 +165,7 @@ func GetOrderById(oId string) (order *Order) {
 		beego.BeeLogger.Error("get order by id=%s err=%s", oId, err)
 		order = nil
 	}
-	if len(order.ExpressOrderNo) > 0 {
+	if order != nil && len(order.ExpressOrderNo) > 0 {
 		order.Sign = GenExpressPassword(order.ExpressOrderNo)
 	}
 	return order