The musical “Chicago” has a killer track record of guessing who the next name on everybody’s lips is gonna be. Whether it’s Melanie Griffith, Brooke Shields, Pamela Anderson, Christie Brinkley, Ariana Madix or Usher, producers Fran and Barry Weissler have long embraced hiring untested stars who have not only never been on Broadway, but have no association with theater whatsoever.  Can they sing? Can they dance? Can they sell ? The couple’s risky strategy has paid off — well, most of the time —