private function importUgroups(Project $project, SimpleXMLElement $xml_element)
 {
     $this->logger->info("Check if there are ugroups to add");
     if ($xml_element->ugroups) {
         $this->logger->info("Some ugroups are defined in the XML");
         $ugroup_in_xml = $this->getUgroupsFromXMLToAdd($project, $xml_element->ugroups);
         foreach ($ugroup_in_xml as $ugroup) {
             $this->logger->debug("Creating empty ugroup " . $ugroup['name']);
             $new_ugroup_id = $this->ugroup_manager->createEmptyUgroup($project->getID(), $ugroup['name'], $ugroup['description']);
             if (empty($ugroup['users'])) {
                 $this->logger->debug("No user to add in ugroup " . $ugroup['name']);
             } else {
                 $this->logger->debug("Adding users to ugroup " . $ugroup['name']);
             }
             foreach ($ugroup['users'] as $user) {
                 $this->logger->debug("Adding user " . $user->getUserName());
                 $this->ugroup_manager->addUserToUgroup($project->getID(), $new_ugroup_id, $user->getId());
             }
         }
     }
 }