Process empty songs
Process empty songs

Closes #1334.

alexesprit/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,carpet-berlin/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,carpet-berlin/web-scrobbler,alexesprit/web-scrobbler,david-sabata/web-scrobbler,Paszt/web-scrobbler,inverse/web-scrobbler,inverse/web-scrobbler,Paszt/web-scrobbler,galeksandrp/web-scrobbler,galeksandrp/web-scrobbler,david-sabata/web-scrobbler