koord-scheduler: fix Reservation Score divide by zero with some empty…

[eahydra]

… resources

Signed-off-by: Joseph joseph.t.lee@outlook.com

Ⅰ. Describe what this PR does

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

[jasonliu747]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: jasonliu747

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[codecov]

Codecov Report

Merging #565 (17df91b) into main (c849440) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #565      +/-   ##
==========================================
- Coverage   67.16%   67.13%   -0.03%     
==========================================
  Files         164      164              
  Lines       17762    17762              
==========================================
- Hits        11930    11925       -5     
- Misses       4948     4957       +9     
+ Partials      884      880       -4     

Flag	Coverage Δ
unittests	67.13% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
pkg/scheduler/plugins/reservation/rcache.go	89.07% <100.00%> (ø)
pkg/koordlet/runtimehooks/reconciler/reconciler.go	71.57% <0.00%> (-7.37%)	⬇️
pkg/util/httputil/reverseproxy.go	84.84% <0.00%> (+0.53%)	⬆️

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