The check to see if initial_reply_to is defined was also comparing $_ to
"" for a reason I cannot ascertain (looking at the commit which made the
change didn't provide enlightenment), but if $_ is undefined, perl
generates a warning.
Signed-off-by: Jay Soffian <jaysoffian@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>