handle corrupted usedbbox in Document:getUsedBBoxDimensions()
handle corrupted usedbbox in Document:getUsedBBoxDimensions()

Frenzie/koreader-base,robert00s/koreader,frankyifei/koreader-base,Frenzie/koreader-base,noname007/koreader,Frenzie/koreader-base,frankyifei/koreader-base,houqp/koreader-base,koreader/koreader,Hzj-jie/koreader,lgeek/koreader,apletnev/koreader-base,NiLuJe/koreader-base,koreader/koreader,koreader/koreader-base,koreader/koreader-base,Hzj-jie/koreader-base,koreader/koreader-base,apletnev/koreader,NiLuJe/koreader-base,poire-z/koreader,Frenzie/koreader,mwoz123/koreader,pazos/koreader,mihailim/koreader,Markismus/koreader,houqp/koreader,NiLuJe/koreader-base,frankyifei/koreader,Hzj-jie/koreader-base,Frenzie/koreader,apletnev/koreader-base,houqp/koreader-base,frankyifei/koreader-base,Hzj-jie/koreader-base,NiLuJe/koreader,NiLuJe/koreader,chihyang/koreader,poire-z/koreader,apletnev/koreader-base,ashhher3/koreader,chrox/koreader,houqp/koreader-base,frankyifei/koreader-base,NickSavage/koreader,houqp/koreader-base,NiLuJe/koreader-base,Hzj-jie/koreader-base,apletnev/koreader-base,ashang/koreader,Frenzie/koreader-base,koreader/koreader-base