[banshee] [TrackActions] Prevent crash in search-for-same

[Gabriel Burt <gburt src gnome org>]

commit 6fcc86b3599c764baf419a57477753968c86d37b
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Thu Aug 12 18:03:54 2010 -0700

    [TrackActions] Prevent crash in search-for-same
    
    Specifically, when artist/album are blank/null.  Fixes bgo#626786.

 .../Banshee.Gui/TrackActions.cs                    |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Gui/TrackActions.cs b/src/Core/Banshee.ThickClient/Banshee.Gui/TrackActions.cs
index 0f369d4..4f68208 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Gui/TrackActions.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Gui/TrackActions.cs
@@ -496,7 +496,9 @@ namespace Banshee.Gui
         {
             if (current_source != null) {
                 foreach (TrackInfo track in current_source.TrackModel.SelectedItems) {
-                    ActiveSource.FilterQuery = BansheeQuery.ArtistField.ToTermString (":", track.ArtistName);
+                    if (!String.IsNullOrEmpty (track.ArtistName)) {
+                        ActiveSource.FilterQuery = BansheeQuery.ArtistField.ToTermString (":", track.ArtistName);
+                    }
                     break;
                 }
             }
@@ -506,7 +508,9 @@ namespace Banshee.Gui
         {
             if (current_source != null) {
                 foreach (TrackInfo track in current_source.TrackModel.SelectedItems) {
-                    ActiveSource.FilterQuery = BansheeQuery.AlbumField.ToTermString (":", track.AlbumTitle);
+                    if (!String.IsNullOrEmpty (track.AlbumTitle)) {
+                        ActiveSource.FilterQuery = BansheeQuery.AlbumField.ToTermString (":", track.AlbumTitle);
+                    }
                     break;
                 }
             }