Fix DefaultConference init
Fix DefaultConference init

fixes #2068

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