[cairo] glitz crash fix patch for show_glyphs

[Vladimir Vukicevic]

The attached patch fixes a crash when show_glyphs is called on a
surface with a glyph that has no area itself, e.g. ' ' (space). 
cairo-glitz-surface.c was already using a static _empty_area for that,
but it would try to call move_out on the " " glyph and crash, because
_empty_area->root == NULL.

I'm not 100% positive this is the right fix -- it certainly fixes my
crashing and causes correct text rendering to happen, but perhaps the
bug is that move_in/move_out should not be called at all on glyphs
with empty area.

Patch attached.

    - Vlad
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