song: use '?tag' to get tag or empty string

1 files changed, 5 insertions, 1 deletions

diff --git a/nephilim/song.py b/nephilim/song.py
index f322fa4..fb18ed3 100644
--- a/nephilim/song.py
+++ b/nephilim/song.py
@@ -22,7 +22,8 @@ from common import sec2min
 
 class Song(dict):
     """Song provides a dictionary-like wrapper around song metadata.
-       Its instances _shouldn't_ be stored, use SongRef or PlaylistEntryRef for that."""
+       Its instances _shouldn't_ be stored, use SongRef or PlaylistEntryRef for that.
+       Access '?tag' to get always at least an empty string. """
 
     def __init__(self, data):
         for tag in data:
@@ -45,6 +46,9 @@ class Song(dict):
         try:
             return dict.__getitem__(self, key)
         except KeyError:
+            if key and key[0] == '?':
+                key = key[1:]
+                return self[key] if key in self else ''
             if key == 'tracknum':
                 try:
                     return int(self['track'])