Fix deleting tracks with accepted abstracts
Fix deleting tracks with accepted abstracts

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