[orca] Handle index error when working around broken web text implementations

[Joanmarie Diggs <joanied src gnome org>]

commit 82aa9f2a04afb47129a50a19645e009545894224
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Mar 18 13:52:49 2019 -0400

    Handle index error when working around broken web text implementations

 src/orca/scripts/web/script_utilities.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index 42c74f6fe..5b2d51ee7 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -976,7 +976,11 @@ class Utilities(script_utilities.Utilities):
 
         allText = text.getText(0, -1)
         if boundary == pyatspi.TEXT_BOUNDARY_CHAR:
-            string = allText[offset]
+            try:
+                string = allText[offset]
+            except IndexError:
+                string = ""
+
             return string, offset, offset + 1
 
         extents = list(text.getRangeExtents(offset, offset + 1, 0))