kubeovn / kube-ovn / 22256889176

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fix(controller): prevent NPE in isOvnSubnet when subnet is nil
When an IP CR references a deleted subnet, handleUpdateIP calls
isOvnSubnet with a nil subnet pointer, causing a panic that puts
the controller into CrashLoopBackOff. Add a nil check so that
isOvnSubnet safely returns false for nil input.

Fixes #6309

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>

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