git p4: fix unit tests
git p4: fix unit tests

The submit-edit tests relied on P4EDITOR being unset. Set it
explicitly to an empty string.

Signed-off-by: Luke Diamand <6b3799be4300e44489a08090123f3842e6419da5@diamand.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git