[FIX] Add participant accepts partially empty name
[FIX] Add participant accepts partially empty name

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