[orca] Add a sanity check to the gtk toolkit script utilities

[Joanmarie Diggs <joanied src gnome org>]

commit 93297ae2656b80afd92925957743186d3ea07211
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sat Nov 23 19:37:07 2013 -0500

    Add a sanity check to the gtk toolkit script utilities

 src/orca/scripts/toolkits/gtk/script_utilities.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/gtk/script_utilities.py 
b/src/orca/scripts/toolkits/gtk/script_utilities.py
index 7a32699..39f719e 100644
--- a/src/orca/scripts/toolkits/gtk/script_utilities.py
+++ b/src/orca/scripts/toolkits/gtk/script_utilities.py
@@ -40,7 +40,7 @@ class Utilities(script_utilities.Utilities):
             return displayedText
 
         # Present GtkLabel children inside a GtkListBox row.
-        if obj.parent.getRole() == pyatspi.ROLE_LIST_BOX:
+        if obj.parent and obj.parent.getRole() == pyatspi.ROLE_LIST_BOX:
             labels = self.unrelatedLabels(obj, onlyShowing=False)
             displayedText = " ".join(map(self.displayedText, labels))