“Glee” star Mark Salling was polite when a group of girls tried to audition for him in a New York club. Salling headed to Meatpacking hot spot Tenjune with some guys Saturday night and ended up partying with Robert Iler, “Jersey Shore” star Ronnie Magro and a group of models. A source said, “Girls were surrounding their table, and one group tried to sing and dance to get a part in ‘Glee.’ Mark was kind but didn’t have the heart to tell him he has absolutely nothing to do with casting.”