Don't match any font if there's no glyph coverage
Don't match any font if there's no glyph coverage

Do not return a font face at all instead of using the last one. Fixes
fallback to the default font path.

MrSmile/libass,astiob/libass,Akemi/libass,torque/libass,xbmc/libass,astiob/libass,mwgoldsmith/libass,mwgoldsmith/libass,MrSmile/libass,stps/libass,libass/libass,sanyaade-g2g-repos/libass,Akemi/libass,stps/libass,torque/libass,mwgoldsmith/libass,ShiftMediaProject/libass,sanyaade-g2g-repos/libass,ShiftMediaProject/libass,grigorig/libass,stps/libass,Akemi/libass,torque/libass,libass/libass,sanyaade-g2g-repos/libass,grigorig/libass,xbmc/libass