Improve YouTube video title parsing

Set video title as track name if artist and track cannot be extracted from video title.

src/core/content/util.js

@@ -50,10 +50,14 @@ const Util = {
 		}
 
 		// No match? Try splitting, then.
-		if (artist === null && track === null) {
+		if (Util.isArtistTrackEmpty({ artist, track })) {
 			({ artist, track } = this.splitArtistTrack(title));
 		}
 
+		if (Util.isArtistTrackEmpty({ artist, track })) {
+			track = title;
+		}
+
 		return { artist, track };
 	},