Don't stop library scan just because of failure in 1 directory.

Closes #1389

ChangeLog

@@ -28,6 +28,7 @@
 18. Add option to sort smart playlists by title.
 19. Change toolbar colours if palette changes.
 20. Add another qt5ct palette work-around.
+21. Don't stop library scan just because of failure in 1 directory.
 
 2.3.2
 -----

mpd-interface/mpdconnection.cpp

@@ -2124,9 +2124,7 @@ bool MPDConnection::recursivelyListDir(const QString &dir, QList<Song> &songs)
             songs.clear();
         }
         for (const QString &sub: subDirs) {
-            if (!recursivelyListDir(sub, songs)) {
-                return false;
-            }
+            recursivelyListDir(sub, songs);
         }
 
         if (topLevel && !songs.isEmpty()) {