scheduler: fix quota check panic

[shaloulcy]

Ⅰ. Describe what this PR does

fix quota check panic

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 66.07%. Comparing base (6f6ef82) to head (e06532f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...kg/scheduler/plugins/elasticquota/plugin_helper.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2321      +/-   ##
==========================================
- Coverage   66.09%   66.07%   -0.02%     
==========================================
  Files         458      458              
  Lines       54197    54200       +3     
==========================================
- Hits        35823    35815       -8     
- Misses      15801    15813      +12     
+ Partials     2573     2572       -1     

Flag	Coverage Δ
unittests	66.07% <0.00%> (-0.02%)	⬇️

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[saintube]

/lgtm