[orca] Ensure we have a wordString before attempting to speak it

[Joanmarie Diggs <joanied src gnome org>]

commit 28eabbd64242ddc675a4171826a634630accdbaa
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sat Apr 28 21:26:09 2018 -0400

    Ensure we have a wordString before attempting to speak it

 src/orca/scripts/default.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/default.py b/src/orca/scripts/default.py
index 5890095..5d0b1ce 100644
--- a/src/orca/scripts/default.py
+++ b/src/orca/scripts/default.py
@@ -1741,7 +1741,8 @@ class Script(script.Script):
 
         while True:
             [wordString, x, y, width, height] = context.getCurrent(flat_review.Context.ZONE)
-            speech.speak(wordString)
+            if wordString is not None:
+                speech.speak(wordString)
             moved = context.goNext(flat_review.Context.ZONE, flat_review.Context.WRAP_LINE)
             if not moved:
                 break