Junio C Hamano 64f30e948b diff.c: guard config parser from value=NULL ...

diff.external, diff.*.command, diff.color.*, color.diff.* and
diff.*.funcname configuration variables expect a string value.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

2008-02-11 13:11:36 -08:00

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