add ret msg and fix plateNos is nil

liuxiaolong

2020-07-09 844bd2c00b417982ba504d0e2fef8a605ad8c808

 controllers/restriction.go

@@ -32,7 +32,7 @@
   } else {
      resp.Success= false
      resp.Status= http.StatusBadRequest
      resp.Data= nil
      resp.Data= "数据请求失败，请稍后重试"
   }
   c.Data["json"] = resp
   c.ServeJSON()