[gnome-music] window: Drop unused attribute notification_handler

[Marinus Schraal <mschraal src gnome org>]

commit 59869abca07f49b6c29b4be8360bbe272838588c
Author: Jean Felder <jean felder gmail com>
Date:   Tue Jan 30 01:02:29 2018 +0100

    window: Drop unused attribute notification_handler

 gnomemusic/window.py | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/gnomemusic/window.py b/gnomemusic/window.py
index 91840a3..4d61e63 100644
--- a/gnomemusic/window.py
+++ b/gnomemusic/window.py
@@ -78,7 +78,6 @@ class Window(Gtk.ApplicationWindow):
         self.add_action(selectNone)
         self.set_size_request(200, 100)
         self.set_default_icon_name('gnome-music')
-        self.notification_handler = None
         self._loading_counter = 0
 
         self.prev_view = None