[banshee] [a11y] Avoid crash when a11y not enabled

[Gabriel Burt <gburt src gnome org>]

commit 8208e49617b37daa3ea4dadf4276e05d6f2e3044
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Sat Nov 7 15:09:34 2009 -0800

    [a11y] Avoid crash when a11y not enabled

 .../Hyena.Data.Gui/ListView/ListView_Accessible.cs |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/Libraries/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Accessible.cs b/src/Libraries/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Accessible.cs
index e415762..1c8abc7 100644
--- a/src/Libraries/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Accessible.cs
+++ b/src/Libraries/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Accessible.cs
@@ -146,7 +146,10 @@ namespace Hyena.Data.Gui
 
         private void AccessibleCellRedrawn (int column, int row)
         {
-            ((ICellAccessibleParent) Accessible).CellRedrawn (column, row);
+            var accessible = Accessible as ICellAccessibleParent;
+            if (accessible != null) {
+                accessible.CellRedrawn (column, row);
+            }
         }
 
     }