send-email: detect invocation errors earlier
We never even look at the command line arguments until after we have prompted the user for some information. So running "git send-email" without arguments would prompt for "from" and "to" headers, only to then die with "No patch files specified." Instead, let's try to do as much error checking as possible before getting user input. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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