Search properly at the wall. The wall is the most deepest part in the room, which can be hardly miss out. It doesnt matter which version, as it was there even my first play through on version 1.0, unless your game is bugged. You get a chest with some contents and a skill book if I recall correctly.
You can bang the door and stay there for an hour you like, which I assure you there nothing more there. By the right both doors spawn mobs. If the mobs being spawned, its just left for display.
