Easy spacing fixes, trailing stuff

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

modules/parolesmusique/backend.py

@@ -48,7 +48,7 @@ class ParolesmusiqueBackend(BaseBackend, ICapLyrics):
             sl = self.get_lyrics(songlyrics.id)
             songlyrics.content = sl.content
         return songlyrics
-   
+
     OBJECTS = {
         SongLyrics:fill_songlyrics
     }