mktag.c: improve verification of tagger field and tests
Since nearly its birth, git's tags have included a "tagger" field which describes the name of tagger, email of tagger, and date and time of tagging. But, this field was only loosely tested by git-mktag. Provide some thorough testing for this field and also ensure that the tag header is separated from the tag body by an empty line to reduce the convenience of creating a flawed tag. Signed-off-by: NBrandon Casey <casey@nrlssc.navy.mil> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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