Add validator for mutually exclusive form fields
Add validator for mutually exclusive form fields

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