A couple more ignored article fixes

sublime_music/adapters/subsonic/adapter.py

@@ -642,12 +642,14 @@ class SubsonicAdapter(Adapter):
         try:
             # If we already got the ignored articles from the get_artists, do that here.
             with open(self.ignored_articles_cache_file, "rb+") as f:
-                ignored_articles = pickle.load(f)
+                if ia := pickle.load(f):
+                    ignored_articles = ia
         except Exception:
             try:
                 # Whatever the exception, fall back on getting from the server.
                 if artists := self._get_json(self._make_url("getArtists")).artists:
-                    ignored_articles = artists.ignored_articles
+                    if ia := artists.ignored_articles:
+                        ignored_articles = ia
             except Exception:
                 # Use the default ignored articles.
                 pass

sublime_music/adapters/subsonic/api_objects.py

@@ -284,7 +284,7 @@ class IndexID3:
 @dataclass_json(letter_case=LetterCase.CAMEL)
 @dataclass
 class ArtistsID3:
-    ignored_articles: str
+    ignored_articles: Optional[str] = None
     index: List[IndexID3] = field(default_factory=list)
 
 
@@ -303,7 +303,7 @@ class Genres:
 @dataclass_json(letter_case=LetterCase.CAMEL)
 @dataclass
 class Indexes:
-    ignored_articles: str
+    ignored_articles: Optional[str] = None
     index: List[Index] = field(default_factory=list)