fix specmembername not found,cannot GetTableDataFromCluster

liuxiaolong

2019-12-04 1f819a31e020d4c861807245d35f504ed0d910c3

 agent.go

@@ -505,6 +505,9 @@
      }
   }
   logger.Info("mbs:",mbs,"a.conf.BindAddr:",a.conf.BindAddr,"specmembername:",specmembername)
   if specmembername == "" {//如果未找到目标节点，说明当前集群内除了本节点，没有其他可用节点
      return nil,errors.New("specmembername not found")
   }

   //query: get db file.
   params := serf.QueryParam{