UserHook quit方法中调用ExternalKit.requestGateway(userSession, requestMessage); 抛出异常

参照 https://www.yuque.com/iohao/game/lxqbnb 中的代码进行测试，

操作如下：
    1、启动各个服务端
    2、其他客户端，与对外服务建立连接

```
demo 玩家上线 userId: 1 -- UserChannelId[channelId=acde48fffe001122-000093b0-00000003-c19190091040f34b-b4893c44]
 demo 当前在线玩家数量： 1
```
    3、关闭客户端
        此时对外服务中因为此时执行了 `ExternalKit.requestGateway(userSession, requestMessage);`，所以会得到一个异常
```
17:18:20.618 ERROR [utor-6-thread-9] b.c.e.p.ResponseMessageExternalProcessor.getUserSession(ResponseMessageExternalProcessor.java:81) : Cannot read the array length because "bytes" is null

java.lang.NullPointerException: Cannot read the array length because "bytes" is null
	at java.base/java.lang.String.<init>(String.java:1435)
	at com.iohao.game.bolt.broker.client.external.processor.ResponseMessageExternalProcessor.getUserSession(ResponseMessageExternalProcessor.java:76)
	at com.iohao.game.bolt.broker.client.external.processor.ResponseMessageExternalProcessor.handleRequest(ResponseMessageExternalProcessor.java:53)
	at com.iohao.game.bolt.broker.client.external.processor.ResponseMessageExternalProcessor.handleRequest(ResponseMessageExternalProcessor.java:43)
	at com.alipay.remoting.rpc.protocol.RpcRequestProcessor.dispatchToUserProcessor(RpcRequestProcessor.java:235)
	at com.alipay.remoting.rpc.protocol.RpcRequestProcessor.doProcess(RpcRequestProcessor.java:146)
	at com.alipay.remoting.rpc.protocol.RpcRequestProcessor$ProcessTask.run(RpcRequestProcessor.java:393)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
```

查看异常发生的代码：

```
// 通过 channelId 来查找 UserSession
                byte[] attachmentData = headMetadata.getAttachmentData();
                String channelId = new String(attachmentData);
                return UserSessions.me().getUserSession(new UserChannelId(channelId));
```
`attachmentData` 为null, 应该要判断一下是否为null,此时客户端已关闭，`UserSession`应该查找不到的。

渔民小镇/ioGame

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