fix(rpc-triple): Fix missing error code

[oxsean]

What is the purpose of the change

Fix ci execution failed due to missing error code

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.
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• 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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• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fe4a9f3) 40.67% compared to head (ed9351e) 40.69%.

❗ Current head ed9351e differs from pull request most recent head b152e5b. Consider uploading reports for the commit b152e5b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              3.3   #13379      +/-   ##
==========================================
+ Coverage   40.67%   40.69%   +0.01%     
==========================================
  Files        1806     1806              
  Lines       75807    75807              
  Branches    10637    10637              
==========================================
+ Hits        30838    30847       +9     
+ Misses      40644    40642       -2     
+ Partials     4325     4318       -7     

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[chickenlj]

LGTM.

[EarthChen]

LGTM