启动dubbo-go 服务过段时间zk的监听会报错，但是貌似不影响服务调用

[jack15083]

What happened:
2020-09-03T17:33:28.149+0800 ?[31mERROR?[0m zookeeper/client.go:589 zk.Children(path{}) = error(zk: invalid path)
github.com/apache/dubbo-go/common/logger.Errorf
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/common/logger/logging.go:52
github.com/apache/dubbo-go/remoting/zookeeper.(*ZookeeperClient).GetChildren
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/client.go:589
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).handleZkNodeEvent
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:135
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).listenDirEvent
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:325
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent.func1
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:357
2020-09-03T17:33:28.150+0800 ?[31mERROR?[0m zookeeper/listener.go:146 path{} child nodes changed, zk.Children() = error{zk.Children(path:): zk: invalid path}
github.com/apache/dubbo-go/common/logger.Errorf
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/common/logger/logging.go:52
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).handleZkNodeEvent
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:146
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).listenDirEvent
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:325
github.com/apache/dubbo-go/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent.func1
C:/Users/MST/go/pkg/mod/github.com/apache/[email protected]/remoting/zookeeper/listener.go:357

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

[jack15083]

通过查看源吗我知道是什么问题了，感觉是有段代码有bug，希望尽快确认下

zkEvent 在没有childEventCh输入时，zkEvent.path为空，定时器的任务还在执行，导致每隔10分钟就会有上面的报错 zk: invalid path

代码位置remoting/zookeeper/listener.go 325行