[orca] Fix a null check

[Joanmarie Diggs <joanied src gnome org>]

commit 85d5ab181470aa00ab3240cf3a5a568a5a47151d
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Feb 15 14:38:39 2016 -0500

    Fix a null check

 src/orca/scripts/web/script_utilities.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index 622a3a3..425d996 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -2905,7 +2905,7 @@ class Utilities(script_utilities.Utilities):
         result.append(messages.tableCount(counts.get('tables', 0), onlyIfFound))
         result.append(messages.visitedLinkCount(counts.get('visitedLinks', 0), onlyIfFound))
         result.append(messages.unvisitedLinkCount(counts.get('unvisitedLinks', 0), onlyIfFound))
-        result = filter(lambda x: x, result)
+        result = list(filter(lambda x: x, result))
         if not result:
             return ""