Undef slot before destroying in unset_property

We need to make sure that destructors can't access the partially
destroyed property. Do the same we do in HTs.

Fixes oss-fuzz #362

Undef slot before destroying in unset_property

We need to make sure that destructors can't access the partially
destroyed property. Do the same we do in HTs.

Fixes oss-fuzz #36205.

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