prevents game from crashing when you exit a level while picking somet…

…hing up.

fixes hawkthorne#1202

src/nodes/door.lua

@@ -136,6 +136,7 @@ function Door:keypressed( button, player)
     if self.hideable and self.hidden then return end
     if button == self.button or button=="INTERACT" then
         self:switch(player)
+        return true
     end
 end