Manhattan District Attorney Alvin Bragg just got a huge gift with the potential perjury guilty plea of former Trump Organization chief accountant Allen Weisselberg, former federal prosecutor Renato Mariotti argued on MSNBC Thursday. Bragg is prosecuting a criminal business fraud case against the former president, stemming from his alleged concealment of hush payments to adult film star Stormy Daniels. “Your reaction to this news?” asked anchor Katie Phang, herself an attorney. “I guess timing is everything, right? We are waiting for Judge Arthur Engoron to issue his ruling on the remaining cou…