Catch one last Exception from Artist::__construct().
Catch one last Exception from Artist::__construct().

Instead of returning a white screen of death with an uncaught exception
message, omit artist information from the XML document when the artist
of a loved or banned track can't be found. This should also resolve
issue #209, though a more thorough analysis of the cause should be done.

foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm