diff: reject unknown change class given to --diff-filter
authorJunio C Hamano <gitster@pobox.com>
Wed, 17 Jul 2013 22:27:19 +0000 (15:27 -0700)
committerJunio C Hamano <gitster@pobox.com>
Wed, 17 Jul 2013 23:24:14 +0000 (16:24 -0700)
We used to accept "git diff --diff-filter=Q" (note that there is no
such change class 'Q') silently and showed no output (because there
is no such change class 'Q').

Error out when such an input is given.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
No differences found