Avoid hotloop over empty clusterrole rules

[akalenyu]

What this PR does / why we need it:
For an empty list, we get in a hotloop over it being persisted with nil

2026-01-14T04:29:20Z	INFO	DIFF	{"controller": "migcontroller-controller", "object": {"name":"migcontroller-kubevirt-hyperconverged","namespace":"openshift-cnv"}, "namespace": "openshift-cnv", "name": "migcontroller-kubevirt-hyperconverged", "reconcileID": "d5cabc29-c944-4271-8b88-b5284c55c266", "obj": {"apiVersion": "rbac.authorization.k8s.io/v1", "kind": "ClusterRole", "name": "migrations.kubevirt.io:admin"}, "patch": "[{\"op\":\"add\",\"path\":\"/rules\",\"value\":[]}]"}

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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Release note:

BugFix: event spam over rbac update

[maiqueb]

tks

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/lifecycle stale

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There has been no activity on this PR for 59 days and it has been stale for 14 days.
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/lifecycle rotten

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There has been no activity on this PR for 66 days and it has been rotten for 7 days.
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/close

[kubevirt-bot]

@kubevirt-bot: Closed this PR.

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There has been no activity on this PR for 66 days and it has been rotten for 7 days.
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[akalenyu]

/reopen

[kubevirt-prow]

@akalenyu: Reopened this PR.

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/reopen

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[akalenyu]

/remove-lifecycle rotten

[akalenyu]

/cc @mhenriks

[mhenriks]

/approve

[kubevirt-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akalenyu, maiqueb, mhenriks

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