[cu2qu.ufo] skip processing empty glyphs to support sparse kerning masters #3956
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This will help with the use case described at googlefonts/fontmake#1158
varLib already treats empty glyphs in non-default 'sparse' masters as non participating in gvar interpolation. But if a designspace contains a UFO with such empty glyphs, cu2qu rejects them because it expects all input glyphs to have the same number of segments.