Fix error for log entries with no user
Fix error for log entries with no user

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