[PATCH v2] render: Fix crash in RenderAddGlyphs (#23645)

[Keith Packard]

Excerpts from Peter Hutterer's message of Tue Sep 29 22:44:07 -0700 2009:

> Question is now what to do - simply skipping the composite call for a NULL
> source should make sense, doesn't it?

Yes, with no bits, no composite is needed :-)

-- 
keith.packard at intel.com
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