“Ghost,” with a book and lyrics by Bruce Joel Rubin, who (unbelievably) won an Oscar for the movie’s screenplay; and music and lyrics by Dave Stewart (of the fab 1980s synth-pop duo the Eurythmics — say it ain’t so!) and Glen Ballard, may not be the very worst musical ever made from a movie. I might give that palm to either “Dirty Dancing” or “Fame,” neither of which has yet made it to Broadway. (Thank the theater gods for small blessings.) But it is just as flavorless and lacking in dramatic vitality as many that have come before.