[gnome-music] disclistboxwidget: Hide tracknumber if 0

[Marinus Schraal <mschraal src gnome org>]

commit 0321d6f95e7aab572ebb00f8f08b90d6a81e40f6
Author: Marinus Schraal <mschraal src gnome org>
Date:   Wed Nov 2 15:30:14 2016 +0100

    disclistboxwidget: Hide tracknumber if 0

 gnomemusic/widgets/disclistboxwidget.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gnomemusic/widgets/disclistboxwidget.py b/gnomemusic/widgets/disclistboxwidget.py
index fc87d0a..6c742ae 100644
--- a/gnomemusic/widgets/disclistboxwidget.py
+++ b/gnomemusic/widgets/disclistboxwidget.py
@@ -321,9 +321,12 @@ class DiscBox(Gtk.Box):
         song_widget.itr = itr
         song_widget.model = self._model
 
+        track_number = track.get_track_number()
+        if track_number == 0:
+            track_number = ""
         song_widget.number = builder.get_object('num')
         song_widget.number.set_markup(
-            '<span color=\'grey\'>{}</span>'.format(track.get_track_number()))
+            '<span color=\'grey\'>{}</span>'.format(track_number))
         song_widget.number.set_no_show_all(True)
 
         song_widget.title = builder.get_object('title')