Prevent git blame from segfaulting on a missing author name
The human-readable author and committer name can be missing from commits imported from foreign SCM interfaces. Make sure we parse the "author" and "committer" line a bit more leniently and avoid segfaulting by assuming the name always exists. Signed-off-by: NDavid Reiss <dreiss@facebook.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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