etcdutil: only output the log when picked count > 0 (#7845)

[ti-chi-bot]

This is an automated cherry-pick of #7845

What problem does this PR solve?

Issue Number: close #7844.

What is changed and how does it work?

Only output the log when picked count > 0 in `updateEvictedEps`.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato

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[codecov]

Codecov Report

Merging #7977 (f22dac6) into release-7.5 (3488a65) will increase coverage by 0.10%.
Report is 3 commits behind head on release-7.5.
The diff coverage is 100.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.5    #7977      +/-   ##
===============================================
+ Coverage        74.53%   74.64%   +0.10%     
===============================================
  Files              444      444              
  Lines            48140    48156      +16     
===============================================
+ Hits             35882    35945      +63     
+ Misses            9073     9031      -42     
+ Partials          3185     3180       -5     

Flag	Coverage Δ
unittests	74.64% <100.00%> (+0.10%)	⬆️

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[JmPotato]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f22dac6