I suspect this is the intended behavior. ADDBS() only adds a bs if there is none at the end of the path. If there is no path. there is nothing for it to check, hence it exits without adding anything.

>I have noticed that addbs() does not add a backslash if given an empty path. I'd expect a backslash even in that case, creating a reference to the root! I can't imagine that this was done by design. Who's at vault?