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'reset' command makes fast-import start a branch from scratch. It's name is kept in lookup table but it's sha1 is null_sha1 (special value). 'tag' command can be used to tag a branch by it's name. lookup_branch() is used it that case and it doesn't check for null_sha1. So fast-import writes a tag for null_sha1 object instead of giving a error. Add a check to deny tagging an empty branch and add a corresponding test. Signed-off-by: Dmitry Ivankov <divanorama@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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