Just some defensive programming here so that if the user calls BW::Location.stop and the location observation was never started, it won't throw an exception.
Just some defensive programming here so that if the user calls BW::Location.stop and the location observation was never started, it won't throw an exception.

earthrid/BubbleWrap,hboon/BubbleWrap,dam13n/BubbleWrap,fandor/BubbleWrap,andersennl/BubbleWrap