Fix json errors if e.message is not a string
Fix json errors if e.message is not a string

mic4ael/indico,mic4ael/indico,indico/indico,indico/indico,mvidalgarcia/indico,ThiefMaster/indico,pferreir/indico,DirkHoffmann/indico,mvidalgarcia/indico,ThiefMaster/indico,OmeGak/indico,DirkHoffmann/indico,pferreir/indico,ThiefMaster/indico,DirkHoffmann/indico,OmeGak/indico,mvidalgarcia/indico,ThiefMaster/indico,mvidalgarcia/indico,indico/indico,OmeGak/indico,pferreir/indico,pferreir/indico,mic4ael/indico,DirkHoffmann/indico,OmeGak/indico,indico/indico,mic4ael/indico