'hg commit' fails otherwise in some versions of mercurial because of
the missing user information. Other versions simply throw a warning and
guess though.
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
