🐛 Fix nil pointer in patch Apply

[killianmuldoon]

Signed-off-by: killianmuldoon [email protected]

Fix a nil pointer discovered through fuzzing. This condition is unlikely or impossible to occur in CAPI code, but is possible for consumers of the code.

Part of the broader issue discussed in https://github.com/kubernetes-sigs/cluster-api/pull/6334#issuecomment-1084602280

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[sbueringer]

/approve

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