[f-spot/rubenv-gsoc-2009: 30/86] Fix NullPointerException due the extension method.

[Ruben Vermeersch <rubenv src gnome org>]

commit 495d8fef968c801d8f19e8fd7cfde52f5a8bbb48
Author: Ruben Vermeersch <ruben savanne be>
Date:   Wed Jul 29 13:31:28 2009 +0200

    Fix NullPointerException due the extension method.
    
    The old method returned null when a null argument was passed.

 src/Widgets/Filmstrip.cs |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/Widgets/Filmstrip.cs b/src/Widgets/Filmstrip.cs
index 9c713bb..b2cbe00 100644
--- a/src/Widgets/Filmstrip.cs
+++ b/src/Widgets/Filmstrip.cs
@@ -611,10 +611,11 @@ namespace FSpot.Widgets
 
  		protected virtual Pixbuf GetPixbuf (int i, bool highlighted)
 		{
-			Pixbuf current;
+			Pixbuf current = null;
 			Uri uri = (selection.Collection [i]).DefaultVersion.Uri;
 			try {
-				current = thumb_cache.Get (uri).ShallowCopy ();
+				if (thumb_cache.Get (uri) != null)
+					current = thumb_cache.Get (uri).ShallowCopy ();
 			} catch (IndexOutOfRangeException) {
 				current = null;
 			}