format-patch: improve head calculation for cover-letter
If we do it after the revision traversal we can be sure that this is indeed a commit that will be processed (i.e. not a merge) and it's the top most one (thus removing the NEEDSWORK comment, at least we show the same as 'git diff --stat' output that appears in the cover-letter). While we are at it, since we know there's nothing to generate, exit sooner in all cases, like --cover-letter currently does. Also, if there's nothing to generate and cover-letter is specified, a different code-path might be triggered that is not currently covered in the test-case, so add a test for it. Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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