public function getTopicLink(\Concrete\Core\Tree\Node\Node $topic = null)
 {
     if ($this->cParentID) {
         $c = \Page::getByID($this->cParentID);
     } else {
         $c = \Page::getCurrentPage();
     }
     if ($topic) {
         return \URL::page($c, 'topic', strtolower($topic->getTreeNodeDisplayName()));
     } else {
         return \URL::page($c);
     }
 }