I am a big fan of "empty" rooms. I believe that they are needed to create a sense of suspense, to give PCs a place to hold up, to make the place seem "alive", etc. No one ever falls for a wolf-in-sheep's-clothing if small animals like bunnies are never mentioned. No one ever falls for the trapper, the lurker above, or the stunjelly if they don't encounter empty rooms. Drop out the empty room, and hidden treasure is always found because, on a metagame level, something must be here.
Empty doesn't have to be boring. An empty room should always be a room that appears to be empty (but contains clues to areas around it, dungeon dressing, etc.), and more than a few occupied rooms may appear to be empty as well.
RC