Fix error in zodbimport with numeric event_id
Fix error in zodbimport with numeric event_id

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