[gnome-music] player: No next/previous track if there is no playlist

[Arnel A. Borja <arnelborja src gnome org>]

commit 37e7e12f7cdb8b3d34ef24e5d131404ed823ff77
Author: Arnel A. Borja <arnelborja src gnome org>
Date:   Sat Sep 14 21:42:14 2013 +0800

    player: No next/previous track if there is no playlist
    
    Fixes Play on MPRIS when there is no playlist.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=708103

 gnomemusic/player.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gnomemusic/player.py b/gnomemusic/player.py
index ffa8917..2d9ea24 100644
--- a/gnomemusic/player.py
+++ b/gnomemusic/player.py
@@ -265,7 +265,7 @@ class Player(GObject.GObject):
             return None
 
     def has_next(self):
-        if self.playlist.iter_n_children(None) < 1:
+        if not self.playlist or self.playlist.iter_n_children(None) < 1:
             return False
         elif not self.currentTrack:
             return False
@@ -278,7 +278,7 @@ class Player(GObject.GObject):
             return True
 
     def has_previous(self):
-        if self.playlist.iter_n_children(None) < 1:
+        if not self.playlist or self.playlist.iter_n_children(None) < 1:
             return False
         elif not self.currentTrack:
             return False