t4019 (diff-wserror): add lots of missing &&
t4019 (diff-wserror): add lots of missing &&

Also add test_might_fail in front of the git_config --unset commands that
may be trying to unset a value that never got set (due to a previous
failing test) or that were already unset.

Acked-by: Ævar Arnfjörð Bjarmason <0135fcc047f75af264c800977a73e353c6ba842d@gmail.com>
Reviewed-by: Jonathan Nieder <b57189c5f2fd5b3daf3350a77fde90def1080fa5@gmail.com>
Signed-off-by: Elijah Newren <955405675e5ddb1a110d200661c528aa223ef60f@gmail.com>
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