Fixed workflow tts feature audition (#4867)

api/controllers/console/app/audio.py

@@ -85,7 +85,7 @@ class ChatMessageTextApi(Resource):
             response = AudioService.transcript_tts(
                 app_model=app_model,
                 text=request.form['text'],
-                voice=request.form['voice'] if request.form.get('voice') else app_model.app_model_config.text_to_speech_dict.get('voice'),
+                voice=request.form['voice'],
                 streaming=False
             )