[orca] Don't treat a non-alphabetic link basename as a valid accessible name

[Joanmarie Diggs <joanied src gnome org>]

commit 892ba7088ee344286b4131cb9c281ae185c94eaa
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Apr 15 14:47:01 2019 -0400

    Don't treat a non-alphabetic link basename as a valid accessible name

 src/orca/generator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/generator.py b/src/orca/generator.py
index 863bc6fda..955236e60 100644
--- a/src/orca/generator.py
+++ b/src/orca/generator.py
@@ -335,7 +335,7 @@ class Generator:
                     link = obj.parent
                 if link:
                     basename = self._script.utilities.linkBasename(link)
-                    if basename:
+                    if basename and basename.isalpha():
                         result.append(basename)
         # To make the unlabeled icons in gnome-panel more accessible.
         try: