Disable book button if no object is selected
Disable book button if no object is selected

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