CoverBrowser: avoid crash when indexing some cre documents (#3293)
CoverBrowser: avoid crash when indexing some cre documents (#3293)


NiLuJe/koreader,koreader/koreader,mihailim/koreader,NiLuJe/koreader,poire-z/koreader,Hzj-jie/koreader,Frenzie/koreader,houqp/koreader,poire-z/koreader,koreader/koreader,apletnev/koreader,mwoz123/koreader,pazos/koreader,Markismus/koreader,Frenzie/koreader,lgeek/koreader