Check the font pointer being NULL to avoid crashes for at least one class

2006-03-01  Tor Lillqvist  <tml@novell.com>

	* pango/pango-context.c (update_metrics_from_items): Check the
	font pointer being NULL to avoid crashes for at least one class of
	"bad" fonts (those without a Unicode cmap) on Win32. It would
	probably be better to prune out such fonts already in the
	enumeration phase. That would require opening (CreateFontIndirect)
	every font, though, to be able to check with GetFontData() whether
	there is a Unicode cmap. Don't know how much that would slow down
	the enumeration.

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