bisect run: die if no command is given
It was possible to invoke "git bisect run" without any command. This considers all commits as good commits since "$@"'s return value for empty $@ is 0. This is most probably not what a user wants (otherwise she would invoke "git bisect run true"), so not providing a command now results in an error. Signed-off-by: NStephan Beyer <s-beyer@gmx.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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