make get_path_safe return None when no tag value

diff --git a/flac_archive/tags.py b/flac_archive/tags.py
index e2a8eef1cc596e5babead6262f9e0135cd27f8a9..c32c39dd692af7fe955ff10f75f94c53927fb535 100644 (file)
--- a/flac_archive/tags.py
+++ b/flac_archive/tags.py
@@ -80,7 +80,10 @@ class Tags(object):
         return result
 
     def get_path_safe(self, key, track=None):
-        return self.gets(key, track=track, separator=' ').replace('/', '_')
+        value = self.gets(key, track=track, separator=' ')
+        if value is None:
+            return
+        return value.replace('/', '_')
 
     def make_filename(self):
         # Assemble space-delimited filename parts.