[banshee] [ThickClient] Fix album grid missing-artwork rendering

[Gabriel Burt <gburt src gnome org>]

commit fe0bc0c435c3ce672a080959463b057429a5dba1
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Sun Nov 7 15:34:51 2010 -0600

    [ThickClient] Fix album grid missing-artwork rendering
    
    Bug was recently introduced with commit "[CoverArtSpec] Return null for
    unknown artists".

 .../Banshee.Collection.Gui/DataViewChildAlbum.cs   |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/DataViewChildAlbum.cs b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/DataViewChildAlbum.cs
index b4e0f53..1cc5733 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/DataViewChildAlbum.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/DataViewChildAlbum.cs
@@ -129,11 +129,7 @@ namespace Banshee.Collection.Gui
         protected override void ClippedRender (CellContext context)
         {
             var artwork_id = BoundObject as string;
-            if (artwork_id == null) {
-                return;
-            }
-
-            var image_surface = artwork_manager != null
+            var image_surface = artwork_id != null && artwork_manager != null
                 ? artwork_manager.LookupScaleSurface (artwork_id, (int)ImageSize, true)
                 : null;