[gnome-music] mpris: verify that current track is still valid when fetching info

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit ddf01751201d47884a84e55f1634048565ed9b70
Author: Vadim Rutkovsky <vrutkovs redhat com>
Date:   Tue Feb 10 13:11:03 2015 +0100

    mpris: verify that current track is still valid when fetching info

 gnomemusic/mpris.py |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)
---
diff --git a/gnomemusic/mpris.py b/gnomemusic/mpris.py
index 0064a61..2899dd0 100644
--- a/gnomemusic/mpris.py
+++ b/gnomemusic/mpris.py
@@ -346,15 +346,16 @@ class MediaPlayer2Service(dbus.service.Object):
 
     @log
     def _on_playlist_modified(self, path=None, _iter=None, data=None):
-        path = self.player.currentTrack.get_path()
-        currentTrack = self.player.playlist[path][self.player.playlistField]
-        track_list = self._get_track_list()
-        self.TrackListReplaced(track_list, self._get_media_id(currentTrack))
-        self.PropertiesChanged(self.MEDIA_PLAYER2_TRACKLIST_IFACE,
-                               {
-                                   'Tracks': track_list,
-                               },
-                               [])
+        if self.player.currentTrack and self.player.currentTrack.valid():
+            path = self.player.currentTrack.get_path()
+            currentTrack = self.player.playlist[path][self.player.playlistField]
+            track_list = self._get_track_list()
+            self.TrackListReplaced(track_list, self._get_media_id(currentTrack))
+            self.PropertiesChanged(self.MEDIA_PLAYER2_TRACKLIST_IFACE,
+                                   {
+                                       'Tracks': track_list,
+                                   },
+                                   [])
 
     @log
     def _reload_playlists(self):