Rebecca Rubin Film and Media ReporterSince the pandemic, it’s been feast or famine at the box office. And after dining out in spectacular fashion for much of the summer, movie theaters are bracing for a starvation diet this fall.With a series of question marks on the calendar through the remainder of the year, there’s at least one movie that exhibitors expect to triumph. The bad news? It’s coming to Netflix.The highly anticipated “Glass Onion: A Knives Out Mystery” will debut Dec.