[cairo] test ft-font-create-for-ft-face fails

[Christian Biesinger]

sunmoon1997 wrote:
> hi,
>   while running testsuit in cairo, the test ft-font-create-for-ft-face
> failed with a pretty crash. After a quick look, the problem is
> FcPatternAddString in fontconfig 2.4 branch doesn't accept null string
> any more. The fix should be trivial, but I don't know the fix should go
> cairo or fontconfig, so I attached both of them for review.

Note https://bugs.freedesktop.org/show_bug.cgi?id=4674

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