1、fix after offline and online error

[xieshouyu]

What is the purpose of the change

1、After the QoS offline, executing the QoS online will report an error

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 18.75000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 64.69%. Comparing base (9a4aadd) to head (1a53e96).
Report is 23 commits behind head on 3.1.

Files with missing lines	Patch %	Lines
...he/dubbo/registry/nacos/NacosServiceDiscovery.java	9.09%	10 Missing ⚠️
.../registry/zookeeper/ZookeeperServiceDiscovery.java	40.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.1   #12044      +/-   ##
============================================
- Coverage     64.70%   64.69%   -0.02%     
  Complexity       14       14              
============================================
  Files          1433     1433              
  Lines         60084    60086       +2     
  Branches       8830     8832       +2     
============================================
- Hits          38879    38870       -9     
- Misses        17118    17131      +13     
+ Partials       4087     4085       -2     

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