print pruned albums if artist wasn't pruned

src/layers/dedupe.py

@@ -12,20 +12,27 @@ class Dedupe(Layer):
     def _process(self, left: Root):
         right = self.other
         existing_artists = right.by_name()
+        pruned_artists = list()
         for artist in left:
             artist_name = artist.name
             if artist_name in existing_artists:
-                self.prune_artist(artist, right[artist_name])
+                pruned_albums = self.prune_artist(artist, right[artist_name])
                 if len(artist.contents) == 0:
-                    left.prune(artist_name)
+                    pruned_artists.append(artist_name)
                     self.log.info('PRN', f"Pruned artist: {artist_name}")
+                else:
+                    for album_name in pruned_albums:
+                        self.log.info('PRN', f"Pruned album: {album_name}")
             else:
                 continue # todo: fuzzy matching
+        [left.prune(artist) for artist in pruned_artists]
 
-    def prune_artist(self, left: Artist, right: Artist):
+    @staticmethod
+    def prune_artist(left: Artist, right: Artist):
         existing_albums = right.by_name()
-        for album in left:
-            album_name = album.name
-            if album_name in existing_albums:
+        pruned_albums = list()
+        for album_name in existing_albums:
+            if album_name in left.by_name():
                 left.prune(album_name)
-                self.log.info('PRN', f"Pruned album: {album_name}")
+                pruned_albums.append(album_name)
+        return pruned_albums