[banshee] [Podcasting] Fix selection bug w/ DAP plugged in (bgo#636077)

[Gabriel Burt <gburt src gnome org>]

commit 8517cfe9fc9e6eb04dd1032ae3c2c4394efcb04b
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Thu Dec 16 15:30:39 2010 -0600

    [Podcasting] Fix selection bug w/ DAP plugged in (bgo#636077)
    
    If you had a device plugged in, the hidden sync playlist created to
    determine which podcast episodes to sync was screwing up the action
    sensitivity/selection of the Podcasts source.

 .../Banshee.Podcasting.Data/PodcastSource.cs       |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/Extensions/Banshee.Podcasting/Banshee.Podcasting.Data/PodcastSource.cs b/src/Extensions/Banshee.Podcasting/Banshee.Podcasting.Data/PodcastSource.cs
index 367b9b4..f60b7b1 100644
--- a/src/Extensions/Banshee.Podcasting/Banshee.Podcasting.Data/PodcastSource.cs
+++ b/src/Extensions/Banshee.Podcasting/Banshee.Podcasting.Data/PodcastSource.cs
@@ -316,7 +316,13 @@ namespace Banshee.Podcasting.Gui
 
         protected override DatabaseTrackListModel CreateTrackModelFor (DatabaseSource src)
         {
-            return PodcastTrackModel = new PodcastTrackListModel (ServiceManager.DbConnection, DatabaseTrackInfo.Provider, src);
+            var model = new PodcastTrackListModel (ServiceManager.DbConnection, DatabaseTrackInfo.Provider, src);
+
+            if (PodcastTrackModel == null) {
+                PodcastTrackModel = model;
+            }
+
+            return model;
         }
 
         protected override IEnumerable<IFilterListModel> CreateFiltersFor (DatabaseSource src)