[orca] Fix for bug #630591 - Orca's _generateDisplayedText should return an empty list when there is no tex

[Joanmarie Diggs <joanied src gnome org>]

commit 4d997deb1a50aa3753f9c474122fb5798ee1ca01
Author: Joanmarie Diggs <joanmarie diggs gmail com>
Date:   Sun Oct 24 15:53:34 2010 -0400

    Fix for bug #630591 - Orca's _generateDisplayedText should return an empty list when there is no text

 src/orca/generator.py |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/orca/generator.py b/src/orca/generator.py
index 6f09457..158ed5b 100644
--- a/src/orca/generator.py
+++ b/src/orca/generator.py
@@ -879,11 +879,13 @@ class Generator:
 
     def _generateDisplayedText(self, obj, **args ):
         """Returns an array of strings for use by speech and braille that
-        represents all the text being displayed by the object. [[[WDW
-        - consider returning an empty array if this is not a text
-        object.]]]
+        represents all the text being displayed by the object.
         """
-        return [self._script.utilities.displayedText(obj)]
+        displayedText = self._script.utilities.displayedText(obj)
+        if not displayedText:
+            return []
+
+        return [displayedText]
 
     #####################################################################
     #                                                                   #