- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of
this repository and believe that this is not a duplicate.
- [ ] I have checked the
[FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository
and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.6.0
* Operating System version: centos 6
* Java version: jdk 1.8
### Steps to reproduce this issue
1. 服务端dubbo 2.7 客户端使用2.6.0 由于集群原因升级到2.7之后zk的curator客户端会造成任务卡住，所以无法升级
2. ause: java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException: For input string: ""
at
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at org.apache.dubbo.common.Version.parseInt(Version.java:128)
at org.apache.dubbo.common.Version.getIntVersion(Version.java:113)
at
org.apache.dubbo.common.Version.isSupportResponseAttachment(Version.java:102)
[ Full content available at: https://github.com/apache/dubbo/issues/5048 ]
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