service输入错误或者不存在的时候，会发生AttributeError: 'NoneType' object has no attribute xxxx

[yp05327]

和#44类似的问题，如果srv不存在则应该返回正确的报错信息
例：

/ac limit ls --srv 不存在的service名

track：

  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/matcher.py", line 40, in handle_cmd
    await handle_ac(f, "ac " + cmd_body)
  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/__init__.py", line 43, in handle_ac
    async with _handing_error(fout):
  File "/usr/local/lib/python3.12/contextlib.py", line 231, in __aexit__
    await self.gen.athrow(value)
> File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/__init__.py", line 37, in _handing_error
    yield
  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/__init__.py", line 50, in handle_ac
    await _handle_limit(fout, result)
  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/__init__.py", line 120, in _handle_limit
    await limit_handler.ls(
  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/utils/permission.py", line 17, in wrapper
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.12/site-packages/nonebot_plugin_access_control/handler/limit_handler.py", line 98, in ls
    rules = [x async for x in service.get_rate_limit_rules()]
AttributeError: 'NoneType' object has no attribute 'get_rate_limit_rules'