The Emperor, based on a book of interviews with elderly government employees in the court of Emperor Haile Selassie of Ethiopia, is every bit as intellectual a docudrama as it sounds, mostly lacking emotional engagement. It’s more like history presented with interspersed activity as window dressing. Those who attend are likely to do so because of actress Kathryn Hunter’s reputation rather than a burning desire to hear about Selassie, who died in 1975.