🐛 Bug: Fix the bug where Tokens usage reports an error when the API is not set.

Author: yym68686

config.py

@@ -200,7 +200,7 @@ def update_info_message(user_id = None):
         f"**🔑 API:** `{replace_with_asterisk(api_key)}`\n\n" if api_key else "",
         f"**🔗 API URL:** `{api_url}`\n\n" if api_url else "",
         f"**🛜 WEB HOOK:** `{WEB_HOOK}`\n\n" if WEB_HOOK else "",
-        f"**🚰 Tokens usage:** `{get_robot(user_id)[0].tokens_usage[str(user_id)]}`\n\n",
+        f"**🚰 Tokens usage:** `{get_robot(user_id)[0].tokens_usage[str(user_id)]}`\n\n" if get_robot(user_id)[0] else "",
         f"**📖 Version:** `{get_version_info()}`\n\n",
     ])