properly generate clozed latex in unused media check (#775)
properly generate clozed latex in unused media check (#775)

jakesyl/ruby-card,florianjacob/anki,sunclx/anki,Stvad/anki,kenjhim/anki,hssm/anki,weihautin/anki,abeyer/anki,hssm/anki,LucasCabello/anki,Arthaey/anki,weihautin/anki,subfusc/anki,socialpercon/anki-1,jkitching/anki,eduOS/anki,jakesyl/ruby-card,xuewenfei/anki,holycrepe/anki,ospalh/libanki3,go38/anki