fix to avoid common hook warning if no hook is overridden

[rohitgr7]

What does this PR do?

Fixed a small mistake made here: #10603
which is raising the warning always on master even when the hook is not overridden

Does your PR introduce any breaking changes? If yes, please list them.

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cc @Borda @justusschock @awaelchli @ninginthecloud

[krshrimali]

Just a small question.

[tchaton]

LGTM !

[krshrimali]

LGTM!