Caught exception when ws.spotify.com couldn't be resolved.

This fixes #10 by catching the exception thrown when ws.spotify.com
could not be resolved.  In the case the name cannot be resolved then a
blank image will be saved in its place.
Remove unnecessary code.

Hopefully this fixes #9.  I'm not sure why I went through such a complex
way of saving a blank image.  Maybe I had it doing more complicated
stuff in the past that eventually got removed.  Regardless, I'm hoping
this fixes the issue or at least exposes a more detailed error message.