Jack Black’s bandmate used the assassination attempt on former President Donald J. Trump as the butt of a sick joke onstage as part of a birthday celebration thrown amid a concert held in Sydney on Sunday. Black didn’t call Kyle Gass out on the comment. Nor did he walk it back in any way. No. By way of omission, Black joined his Tenacious D bandmate in his bad taste and dark influence over their audience. One post on X, shared the entire incident, which can be viewed below: NEW: Comedian Jack Black’s bandmate makes a “birthday wish” during a performance in Sydney, says he wishes they “don’t mi…