Wonder what traveling on a huge cruise ship with no guests is like? As odd as it may seem, some cruise ships do set sail with zero guests on board. Toronto-based Kabir Bageria, a 28-year-old former cruise director for Royal Caribbean, told Newsweek: "Usually ships never sail with no guests. It happens on extremely rare occasions. It's similar to an airline—if the ship is sailing empty, there's no revenue." Bageira, who worked for several major cruise lines since 2015, including Carnival, said one of these rare sailings took place in May while he was working as the cruise director of…