Field formatter settings summary alter implementations choke on DS Pseudo fields

When a Field Formatter Settings Module comes looking for the instance display settings all it can find is the default one set in line 985 and so it often chokes because it is looking for something else often (custom displays) and with more details (type, etc):

    'instance' => array('display' => array('default' => array('settings' => array()))),

because this is a DS field it has no fully stocked $instance array for the summary unless we make one...so...here is a feeble attempt at pacifying hook_field_formatter_settings_summary_alter() by passing in the current view mode along with some defaults to avoid more notices:

     'instance' => array(
      'display' => array(
        $view_mode => array(
          'label' => '',
          'type' => '',
          'weight' => '',
          'settings' => array(),
          'module' => '',
        )
      )
    ),