dns_resource_record_copy() assumes that NSEC types bitmap is non-empty which results in a null pointer dereference inside bitmap_copy() in some cases. Fix this by calling bitmap_copy() conditionally. (cherry picked from commit 1f00a50c695fe3b55dee38fbd02a902a6c703c87) (cherry picked from commit fc7be6db131a5062dde76ee7857c2f91e1c402cb) (cherry picked from commit 3422b16ef9a85ab0a31558a68db67f148961d4a1)
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