ConsumerRunningInfo deserialize error

**BUG REPORT**

1. Please describe the issue you observed:

When no queues have been allocated, RocketMQ Broker get the client ConsumerRunningInfo will deserialize error.

```java
com.alibaba.fastjson.JSONException: syntax error, expect {, actual }
at com.alibaba.fastjson.parser.deserializer.MapDeserializer.parseMap(MapDeserializer.java:261)
at com.alibaba.fastjson.parser.deserializer.MapDeserializer.deserialze(MapDeserializer.java:71)
at com.alibaba.fastjson.parser.deserializer.MapDeserializer.deserialze(MapDeserializer.java:43)
at com.alibaba.fastjson.parser.deserializer.ContextObjectDeserializer.deserialze(ContextObjectDeserializer.java:9)
at com.alibaba.fastjson.parser.deserializer.FastjsonASMDeserializer_27_ConsumerRunningInfo.deserialze(Unknown Source)
at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:287)
at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:705)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:394)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:298)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:588)
at org.apache.rocketmq.remoting.protocol.RemotingSerializable.fromJson(RemotingSerializable.java:46)
at org.apache.rocketmq.remoting.protocol.RemotingSerializable.decode(RemotingSerializable.java:42)
```

从 ConsumerRunningInfo 的反序列化路径开始，特别是 RemotingSerializable.decode/fromJson 以及报告中显示的 MapDeserializer 错误。在没有分配任何队列时复现 broker 响应，并验证它可以在没有所报告的语法错误的情况下完成反序列化。

由索引模型根据 Issue 内容生成。