[FIX] Handle invalid timezones with a proper error
[FIX] Handle invalid timezones with a proper error

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