LOS ANGELES (REUTERS).- When Johnny Depp appeared on Thursday at a museum to introduce his movie “The Rum Diary,” he was doing what many stars do these days to promote passion projects that are seeing fewer art houses debut their films. Depp put in a personal appearance to build word-of-mouth buzz for his movie among an audience group that most likely favors dramas over the feel-good comedies and escapist fare that are dominating theaters these days. Moreover, he appeared at the Los Angeles County Museum of Art (LACMA) as part of a movie series backed by Los Angeles-based non-profit group Film Independent and LACMA that, like other museums around the country, are hosting more and more events for