[gnome-music] lastfm: don't crash on unpausing

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit da79900685b07f4aef2d185a9bf96dacf297d34f
Author: Vadim Rutkovsky <vrutkovs redhat com>
Date:   Fri Jul 17 15:41:16 2015 +0200

    lastfm: don't crash on unpausing

 gnomemusic/player.py |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/gnomemusic/player.py b/gnomemusic/player.py
index dc0e42a..82a868f 100644
--- a/gnomemusic/player.py
+++ b/gnomemusic/player.py
@@ -682,9 +682,10 @@ class Player(GObject.GObject):
 
         self.player.set_state(Gst.State.PLAYING)
         self._update_position_callback()
-        t = Thread(target=self.update_now_playing_in_lastfm, args=(media.get_url(),))
-        t.setDaemon(True)
-        t.start()
+        if media:
+            t = Thread(target=self.update_now_playing_in_lastfm, args=(media.get_url(),))
+            t.setDaemon(True)
+            t.start()
         if not self.timeout:
             self.timeout = GLib.timeout_add(1000, self._update_position_callback)