Exit can_manage early if user is None
Exit can_manage early if user is None

We check modification keys outside and usually guests are not allowed to
manage anything.

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