[hyena] Handle bad indices in MemoryListModel

[Gabriel Burt <gburt src gnome org>]

commit a3e8b668d60b2d1b9073c8ddd8edc02b8ad49753
Author: Mike Gemünde <mike gemuende de>
Date:   Sat Apr 24 17:41:37 2010 +0200

    Handle bad indices in MemoryListModel
    
    Makes sure that MemoryListModel returns correct values when bad indices are
    given. This makes it compatible with how Banshee's MemoryListModel works.
    
    Without this, grid view crashes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=616710

 src/Hyena/Hyena.Data/MemoryListModel.cs |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/Hyena/Hyena.Data/MemoryListModel.cs b/src/Hyena/Hyena.Data/MemoryListModel.cs
index ae037ee..27ca87e 100644
--- a/src/Hyena/Hyena.Data/MemoryListModel.cs
+++ b/src/Hyena/Hyena.Data/MemoryListModel.cs
@@ -81,6 +81,10 @@ namespace Hyena.Data
         public override T this[int index] {
             get {
                 lock (list) {
+                    if (list.Count <= index || index < 0) {
+                        return default (T);
+                    }
+
                     return list[index];
                 }
             }