[gnome-music/wip/mschraal/utils-album-title-unknown] utils: Improve album title retrieval

[Marinus Schraal <mschraal src gnome org>]

commit 5295b56e46cc129e69f4387bcf39400a7567664a
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Mar 29 23:26:55 2019 +0100

    utils: Improve album title retrieval
    
    A Grl.Media can be a container or a specific media item. In the latter case
    if there was no album title tag, the fallback would be the filename. This
    would result in two columns potentially having the same value in Songs
    view.
    Instead return "Unknown album" if the tag is not available.

 gnomemusic/utils.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/gnomemusic/utils.py b/gnomemusic/utils.py
index 468238da..bae746e7 100644
--- a/gnomemusic/utils.py
+++ b/gnomemusic/utils.py
@@ -49,10 +49,11 @@ def get_album_title(item):
     :return: The album title
     :rtype: string
     """
-    album = item.get_album()
-
-    if not album:
+    if item.is_container():
         album = get_media_title(item)
+    else:
+        album = (item.get_album()
+                 or _("Unknown album"))
 
     return album