[banshee] RhapsodyQueryJob: Fix NRE for track with no album (bgo#646028)

[Gabriel Burt <gburt src gnome org>]

commit 0c5d9f6eda9004ba40f1cbee8bc27e6e8c3f63c0
Author: Zhou Ting <ting z zhou intel com>
Date:   Fri Mar 25 19:01:55 2011 +0800

    RhapsodyQueryJob: Fix NRE for track with no album (bgo#646028)
    
    Signed-off-by: Gabriel Burt <gabriel burt gmail com>

 .../Banshee.Metadata.Rhapsody/RhapsodyQueryJob.cs  |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.Services/Banshee.Metadata.Rhapsody/RhapsodyQueryJob.cs b/src/Core/Banshee.Services/Banshee.Metadata.Rhapsody/RhapsodyQueryJob.cs
index 3c04a24..3f59ff4 100644
--- a/src/Core/Banshee.Services/Banshee.Metadata.Rhapsody/RhapsodyQueryJob.cs
+++ b/src/Core/Banshee.Services/Banshee.Metadata.Rhapsody/RhapsodyQueryJob.cs
@@ -56,6 +56,10 @@ namespace Banshee.Metadata.Rhapsody
 
         private static string GetAlbumUrl (IBasicTrackInfo track)
         {
+            if (track == null || track.AlbumArtist == null || track.AlbumTitle == null) {
+                return null;
+            }
+
             string artist = EscapeUrlPart (track.AlbumArtist);
             string album = EscapeUrlPart (track.AlbumTitle);
             return String.Format ("{0}/{1}", artist, album);
@@ -68,7 +72,8 @@ namespace Banshee.Metadata.Rhapsody
 
         public override void Run()
         {
-            if (Track == null || (Track.MediaAttributes & TrackMediaAttributes.Podcast) != 0) {
+            if (Track == null || (Track.MediaAttributes & TrackMediaAttributes.Podcast) != 0
+                || GetAlbumUrl (Track) == null) {
                 return;
             }