Notice: Undefined property: stdClass::$use_parents_all in smartqueue_taxonomy_nodequeue_subqueues()

This issue here: https://www.drupal.org/node/1869132

Inside smartqueue_taxonomy_nodequeue_subqueues() introduces the following code block:

if (!empty($field_names) && $queue->use_parents_all) {
    // Replace taxonomy IDs with all their parents'.
    foreach ($field_names as $field_name => &$tids) {
      $tids = smartqueue_taxonomy_get_children($tids);
    }
  }

$queue->use_parents_all does not have a !empty()around the property access, so throws an undefined property error where this has not been set on the queue.

The code block above, for $queue->use_parents does correctly have a !empty() around the property access, so this patch will just keep in line with that.