verity: don't explode on null arguments

We explicitly support these to make verity easier to program with.

BUG=None
TEST=Adhoc
verity '' no longer segfaults

Change-Id: I98f4fec431791fad9d9b5f25b78975cc67bd5c59
Signed-off-by: Elly Jones <ellyjones@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/7294
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
1 file changed