[gnome-boxes] view: don't freak out on filtering empty rows

[Marc-Andre Lureau <malureau src gnome org>]

commit 9f62bf2009f25a0f625831f24375b42aef640f33
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Thu Aug 9 15:04:05 2012 +0200

    view: don't freak out on filtering empty rows

 src/collection-view.vala |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/collection-view.vala b/src/collection-view.vala
index 981f514..199cf23 100644
--- a/src/collection-view.vala
+++ b/src/collection-view.vala
@@ -249,7 +249,11 @@ private class Boxes.CollectionView: Boxes.UI {
     }
 
     private bool model_visible (Gtk.TreeModel model, Gtk.TreeIter iter) {
-        return App.app.filter.filter (get_item_for_iter (iter));
+        var item = get_item_for_iter (iter);
+        if (item  == null)
+            return false;
+
+        return App.app.filter.filter (item);
     }
 
     public void refilter () {