There was a bit of drama Friday at the Broadway theater where The Color Purple performs, just not onstage. The lobby of the theater was mobbed by disgruntled ticket holders demanding refunds when ex-American Idol Fantasia, who stars as Celie, failed to turn up for work. Lobby spies for Post columnist Michael Riedel witnessed an 8-year-old girl “sobbing uncontrollably when she heard Fantasia was not going to be in the show.” But it seems there......