*: fix TestClientClusterIDCheck panic

[rleungx]

What problem does this PR solve?

Issue Number: Close #7763.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

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• lhy1024

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[codecov]

Codecov Report

Merging #7764 (d1f1e64) into master (9a82b47) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7764      +/-   ##
==========================================
- Coverage   70.01%   70.01%   -0.01%     
==========================================
  Files         430      430              
  Lines       47641    47641              
==========================================
- Hits        33355    33354       -1     
- Misses      11530    11538       +8     
+ Partials     2756     2749       -7     

Flag	Coverage Δ
unittests	70.01% <ø> (-0.01%)	⬇️

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[HuSharp]

can be fixed in #7766

[HuSharp]

closed by #7766