Update media-player.ts to display artist name as backup secondary tit…

…le (#22039)

* Update media-player.ts to display artist name for playlist if playlist name unavailable

* Run prettier

src/data/media-player.ts

@@ -245,7 +245,8 @@ export const computeMediaDescription = (
       secondaryTitle = stateObj.attributes.media_artist!;
       break;
     case "playlist":
-      secondaryTitle = stateObj.attributes.media_playlist!;
+      secondaryTitle =
+        stateObj.attributes.media_playlist || stateObj.attributes.media_artist!;
       break;
     case "tvshow":
       secondaryTitle = stateObj.attributes.media_series_title!;