[gnome-photos] base-manager: Ref the new active item only if it is non-NULL

[Debarshi Ray <debarshir src gnome org>]

commit 6203c35642895984794493b738b5cd25bb2d8656
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue May 1 00:35:49 2012 +0200

    base-manager: Ref the new active item only if it is non-NULL

 src/photos-base-manager.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/photos-base-manager.c b/src/photos-base-manager.c
index 80c7814..f9728c7 100644
--- a/src/photos-base-manager.c
+++ b/src/photos-base-manager.c
@@ -211,7 +211,9 @@ photos_base_manager_set_active_item (PhotosBaseManager *self, PhotosBaseItem *it
   if (priv->active_item != NULL)
     g_object_unref (priv->active_item);
 
-  g_object_ref (item);
+  if (item != NULL)
+    g_object_ref (item);
+
   priv->active_item = item;
   g_signal_emit (self, signals[ACTIVE_CHANGED], 0, item);
   return TRUE;