fix panic when get elastic resource in proportion plugin

[flyingfang]

fix #3105

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[lowang-bh]

/hold

there is already one pr https://github.com/volcano-sh/volcano/pull/3106

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[volcano-sh-bot]

@flyingfang: PR needs rebase.

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[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.