Update app.py

app.py

@@ -139,8 +139,10 @@ def greet(character,your_voice,message,history):
       html += f"<div class='user_msg'>You: {user_msg}</div>"
       html += f"<div class='resp_msg'>{character}: {resp_msg}</div>"
   html += "</div>"
-
-  return html,history,"tts_output.wav"
+  if your_voice is None:
+      return html,history
+  else:
+      return html,history,"tts_output.wav"