[gnome-music] artistalbumwidget: Handle discbox is None case

[Jean Felder <jfelder src gnome org>]

commit 76b0ff8f7c0b9f7a32c7600f4923aec1dba333db
Author: JamesABaker <baker james jb gmail com>
Date:   Wed Jan 6 13:53:13 2021 +0000

    artistalbumwidget: Handle discbox is None case
    
    Make sure that the discbox is not None before setting the
    show_disc_label property.
    
    This prevents a rare fatal error on launch.
    
    Fixes #430

 gnomemusic/widgets/artistalbumwidget.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gnomemusic/widgets/artistalbumwidget.py b/gnomemusic/widgets/artistalbumwidget.py
index 5993e7cb3..8488032d0 100644
--- a/gnomemusic/widgets/artistalbumwidget.py
+++ b/gnomemusic/widgets/artistalbumwidget.py
@@ -107,7 +107,8 @@ class ArtistAlbumWidget(Gtk.Box):
         n_items = model.get_n_items()
         for i in range(n_items):
             discbox = self._disc_list_box.get_row_at_index(i)
-            discbox.props.show_disc_label = (n_items > 1)
+            if discbox is not None:
+                discbox.props.show_disc_label = (n_items > 1)
 
     def _song_activated(self, widget, song_widget):
         if self.props.selection_mode: