Remove fallback to response_text in response_audio on audio generation failure

app.py

@@ -112,7 +112,6 @@ def response_audio(message_id, chat_id, prompt):
             logging.debug(f"Removed audio file: {audio_file_path}")
         else:
             logging.debug("generate_voice_reply returned None, falling back to response_text")
-            response_text(message_id, chat_id, prompt=prompt)
     except Exception as e:
         logging.debug(f"Exception in response_audio: {e}")
         send_message(message_id, chat_id, "There was an error generating the audio. Please try again later.")