koordlet: fix memory evict for nil podMetric

[saintube]

Signed-off-by: saintube saintube@foxmail.com

Ⅰ. Describe what this PR does

fix the panic in memory evict candidate sorting when any pod metric is not found

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

Base: 68.84% // Head: 68.77% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (ec0fae2) compared to base (ba978b4).
Patch coverage: 62.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #648      +/-   ##
==========================================
- Coverage   68.84%   68.77%   -0.08%     
==========================================
  Files         196      196              
  Lines       22335    22329       -6     
==========================================
- Hits        15377    15357      -20     
- Misses       5880     5891      +11     
- Partials     1078     1081       +3     

Flag	Coverage Δ
unittests	68.77% <62.50%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/koordlet/resmanager/memory_evict.go	69.82% <62.50%> (-2.25%)	⬇️
pkg/scheduler/plugins/elasticquota/controller.go	68.05% <0.00%> (-10.52%)	⬇️
pkg/util/httputil/reverseproxy.go	85.10% <0.00%> (-1.33%)	⬇️
...kg/scheduler/plugins/elasticquota/plugin_helper.go	79.78% <0.00%> (ø)
pkg/scheduler/plugins/elasticquota/plugin.go	74.00% <0.00%> (+0.17%)	⬆️

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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