[orca/gnome-3-10] Fix traceback in the Gecko script.

[Joanmarie Diggs <joanied src gnome org>]

commit a043f6dd460719b9d0791b4507847bc3ccb670c5
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Sep 23 16:18:46 2013 -0400

    Fix traceback in the Gecko script.

 src/orca/scripts/toolkits/Gecko/script.py |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/Gecko/script.py b/src/orca/scripts/toolkits/Gecko/script.py
index 37f8eb2..a3a1886 100644
--- a/src/orca/scripts/toolkits/Gecko/script.py
+++ b/src/orca/scripts/toolkits/Gecko/script.py
@@ -2477,9 +2477,7 @@ class Script(default.Script):
 
             # This might be too restrictive but we need it to filter
             # out URLs that are displayed when the location list opens.
-            if 'tag' in attrs \
-                    and attrs['tag'] == 'xul:description' \
-                    or attrs['tag'] == 'xul:label':
+            if attrs.get('tag') in ['xul:description', 'xul:label']:
                 return False
 
             # This eliminates all ARIA widgets that are not considered live