send-email, fix breakage in combination with --compose
This fixes the subtile bug in git send-email that was introduced into git send-email with aa54892f (send-email: detect invocation errors earlier), which caused no patches to be sent out if the --compose flag was used. Signed-off-by: NGustaf Hendeby <hendeby@isy.liu.se> Tested-by: NSeth Falcon <seth@userprimary.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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