For all binary searches, handle the case where the number of items is 0.

For all binary searches, handle the case where the number of items is 0.

2005-03-03  Owen Taylor  <otaylor@redhat.com>

        * pango/opentype/ftxopen.c (Coverage_Index1, Coverage_Index2,
        Get_Class2): For all binary searches, handle the case where
        the number of items is 0. (#162977, Nick Lamb)

        * pango/opentype/ftxgdef.c (TT_GDEF_Build_ClassDefinition):
        Handle the case where glyph_count == 0 properly. Fix a problem
        with cleanups on memory allocation failure.
        (Get_New_Count, Add_Glyph_Property): Avoid reading off the
        end of the ClassRangeRecord array.