NewsDownloader: Message with details when invalid configuration. (#3658)
NewsDownloader: Message with details when invalid configuration. (#3658)


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