kts.IsDoorOpen – determine whether a door or chest tile is currently open
result = kts.IsDoorOpen(pos) 
If there is a door or chest tile at position pos, then this function returns true if the tile is open, or false if it is closed. 
If there is not a door or chest at pos, this function does not return any values. 
An error is raised if pos is not a valid map position.