Major and even minor Hollywood moguls hate to see a new movie in a public theater much less pay for it. Instead they have their studios build them fancy private screening rooms and then borrow prints from each other to see the latest releases. Well, not this past weekend. Because I’m told that Warner Bros’ Alan Horn was so inundated with requests for The Dark Knight that the studio ran out of prints. “We had more prints in Bel Air on Saturday night than Cleveland,” one WB exec told me. Every mogul who was turned down took no for an answer. But not Sumner Redstone. “Brad Grey emailed Alan and asked if he could intercede and get a print for Sumner, which Alan did,” an insider told me. I suspect someone waylaid a print headed for Podunk and it wound up in Redstone’s Beverly Park screening room…