Fix nil pointer panic in eviction admission

[itonyli]

What type of PR is this?

/kind bug

What this PR does / why we need it:

See #6808

Which issue(s) this PR fixes:

Fixes #
6808

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @itonyli. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[itonyli]

@voelzmo I closed the previous PR and resubmitted a new one. This PR no longer has a license issue. Could you please help me review it

[itonyli]

/assign @voelzmo

[raywainman]

Thoughts on adding a quick test here to prevent future regression?

Thanks!

[raywainman]

/ok-to-test

[itonyli]

Thoughts on adding a quick test here to prevent future regression?

Thanks!

That's an excellent suggestion! I have already added a unit test to prevent any future regression. Thanks for bringing this up!

[voelzmo]

/lgtm

Thanks!

[kwiesmueller]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: itonyli, kwiesmueller

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[voelzmo]

/cherry-pick vpa-release-1.1

[k8s-infra-cherrypick-robot]

@voelzmo: new pull request created: #6833

In response to this:

/cherry-pick vpa-release-1.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.