[orca] speechdispatcherfactory: Avoid setting voice name to None

[Joanmarie Diggs <joanied src gnome org>]

commit a19c07123f884ab76b80a93a38366011b950db44
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Tue Sep 13 07:58:07 2022 +0000

    speechdispatcherfactory: Avoid setting voice name to None

 src/orca/speechdispatcherfactory.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/speechdispatcherfactory.py b/src/orca/speechdispatcherfactory.py
index ad8b48b64..c6558e29c 100644
--- a/src/orca/speechdispatcherfactory.py
+++ b/src/orca/speechdispatcherfactory.py
@@ -261,7 +261,7 @@ class SpeechServer(speechserver.SpeechServer):
             pass
         else:
             name = acss_family.get(speechserver.VoiceFamily.NAME)
-            if name != self._default_voice_name:
+            if name is not None and name != self._default_voice_name:
                 self._send_command(set_synthesis_voice, name)
 
     def _debug_sd_values(self, prefix=""):