PicDocument: log reason of opening failure
PicDocument: log reason of opening failure

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