check if glyph is missing in current fontface
check if glyph is missing in current fontface

frankyifei/koreader-base,frankyifei/koreader-base,koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,apletnev/koreader-base,frankyifei/koreader-base,apletnev/koreader-base,frankyifei/koreader-base,NiLuJe/koreader-base,apletnev/koreader-base,Hzj-jie/koreader-base,Frenzie/koreader-base,Hzj-jie/koreader-base,houqp/koreader-base,Frenzie/koreader-base,apletnev/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,Hzj-jie/koreader-base,koreader/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,Hzj-jie/koreader-base,houqp/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base