[mistelix] Dispose only if the objects are created

[Jordi Mas <jmas src gnome org>]

commit 23d9250211bfb05b6d96ba4e42fd51ccd3aade7e
Author: Jordi Mas <jmas softcatala org>
Date:   Mon Jul 20 06:41:38 2009 +0200

    Dispose only if the objects are created

 src/widgets/FileView.cs           |    6 ++++--
 src/widgets/ProjectElementView.cs |    4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/widgets/FileView.cs b/src/widgets/FileView.cs
index 4447e02..5f1e65a 100644
--- a/src/widgets/FileView.cs
+++ b/src/widgets/FileView.cs
@@ -118,8 +118,10 @@ namespace Mistelix.Widgets
 				return false;
 			});
 
-			thumbnailing.CancelAsync ();
-			thumbnailing.Dispose ();
+			if (thumbnailing != null) {
+				thumbnailing.CancelAsync ();
+				thumbnailing.Dispose ();
+			}
 		}
 
 		public void LoadElements ()
diff --git a/src/widgets/ProjectElementView.cs b/src/widgets/ProjectElementView.cs
index 0b07c98..7a9bcc7 100644
--- a/src/widgets/ProjectElementView.cs
+++ b/src/widgets/ProjectElementView.cs
@@ -103,7 +103,9 @@ namespace Mistelix.Widgets
 			Logger.Debug ("ProjectElementView.Disposing");
 			ClearElements ();
 			def_image.Dispose ();
-			thumbnailing.Dispose ();
+
+			if (thumbnailing != null)
+				thumbnailing.Dispose ();
 		}
 
 		void HandleDragDataGet (object sender, DragDataGetArgs args)