[cairo] patch for show_glyphs for strings consisting of all spaces

[Vladimir Vukicevic]

If a string consisting of all spaces (or other blank characters with
either width or height 0), the call to
cairo_clip_intersect_to_rectangle() in _cairo_gstate_show_glyphs blows
up because, I believe, pixman returns an error due to the 0 width or
height region.  The attached patch just does an early exit from
show_glyphs if the extents are 0-width or 0-height.

     - Vlad
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