[gnome-music] query: do not return objects where tracker does not have FileDataObject information.

[Arnel A. Borja <arnelborja src gnome org>]

commit f1380018a5549f285d2a6cad921a9421402f1cc9
Author: Dominique Leuenberger <dimstar opensuse org>
Date:   Wed Sep 11 22:18:44 2013 +0200

    query: do not return objects where tracker does not have FileDataObject information.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707938

 gnomemusic/query.py |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gnomemusic/query.py b/gnomemusic/query.py
index e40eb8a..b350e22 100644
--- a/gnomemusic/query.py
+++ b/gnomemusic/query.py
@@ -209,7 +209,8 @@ class Query():
         nie:title(nmm:musicAlbum(?song)) AS album
         nfo:duration(?song) AS duration
         {
-            ?song a nmm:MusicPiece
+            ?song a nmm:MusicPiece ;
+                  a nfo:FileDataObject
         }
     ORDER BY tracker:added(?song)
     '''.replace('\n', ' ').strip()
@@ -218,7 +219,8 @@ class Query():
     SELECT
         COUNT(?song) AS childcount
     WHERE {
-        ?song a nmm:MusicPiece
+        ?song a nmm:MusicPiece ;
+              a nfo:FileDataObject
     }
     '''.replace('\n', ' ').strip()
 
@@ -235,6 +237,7 @@ class Query():
         nfo:duration(?song) AS duration
     WHERE {
         ?song a nmm:MusicPiece ;
+              a nfo:FileDataObject ;
               nmm:musicAlbum ?album .
         FILTER (
             tracker:id(?album) = %(album_id)s