Fix unit test failed of logger package.

[wangjian-pg]

Unit test of packagelogger failed since PR #722 merged.

It's kind of weird that a PR that failed the unit test can be merged😂...

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.58%. Comparing base (389f6b6) to head (7a248da).
Report is 1 commits behind head on master.

❗ Current head 7a248da differs from pull request most recent head d30fe56. Consider uploading reports for the commit d30fe56 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #734      +/-   ##
==========================================
- Coverage   32.69%   32.58%   -0.12%     
==========================================
  Files          45       45              
  Lines        3294     3296       +2     
==========================================
- Hits         1077     1074       -3     
- Misses       2136     2140       +4     
- Partials       81       82       +1     

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