def METHOD_NAME(self):
    """Tests that no processing is done if nothing is stored in settings."""
    from octoprint.settings import NoSuchSettingsPath
    ### setup
    # simulate no settings stored in config.yaml
    self.settings.get_all_data.side_effect = NoSuchSettingsPath()
    ### execute
    self.plugin.on_settings_cleanup()
    ### assert
    # only get_all_data should have been called
    self.settings.get_all_data.assert_called_once_with(
        merged=False, incl_defaults=False, error_on_path=True
    )
    self.assertTrue(len(self.settings.method_calls) == 1)