[at-spi2-atk] Don't warn if an app returns NULL when referencing a child

[Mike Gorse <mgorse src gnome org>]

commit f7a825353ec966c1b447a81aec483406cb49853c
Author: Mike Gorse <mgorse suse com>
Date:   Mon May 20 16:25:46 2013 -0500

    Don't warn if an app returns NULL when referencing a child
    
    If atk_object_ref_accessible_child returns NULL when creating the cache,
    then don't attempt to process/unref the NULL item, although applications
    probably shouldn't be returning NULL in response to a call to
    atk_object_ref_accessible_child, so it seems debatable whether we should
    be printing a warning here.

 atk-adaptor/adaptors/cache-adaptor.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/atk-adaptor/adaptors/cache-adaptor.c b/atk-adaptor/adaptors/cache-adaptor.c
index 79a9e6a..cad7396 100644
--- a/atk-adaptor/adaptors/cache-adaptor.c
+++ b/atk-adaptor/adaptors/cache-adaptor.c
@@ -154,8 +154,11 @@ append_cache_item (AtkObject * obj, gpointer data)
             AtkObject *child;
 
             child = atk_object_ref_accessible_child (obj, i);
-            spi_object_append_reference (&iter_sub_array, child);
-            g_object_unref (G_OBJECT (child));
+            if (child)
+              {
+                spi_object_append_reference (&iter_sub_array, child);
+                g_object_unref (G_OBJECT (child));
+              }
           }
       }
     if (ATK_IS_SOCKET (obj) && atk_socket_is_occupied (ATK_SOCKET (obj)))