ref_transaction_delete(): check that old_sha1 is not null_sha1
It makes no sense to delete a reference that is already known not to exist. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Reviewed-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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