[TASK] Refactor method chain call to retrieve timestamp

Classes/Controller/FeElectionController.php

@@ -83,9 +83,7 @@ class FeElectionController extends ActionController
                         AbstractMessage::ERROR
                     );
                     $this->redirect(FeDashboardController::ACTION_INDEX, FeDashboardController::CONTROLLER_NAME);
-                } elseif ($electionInvitation->getElectionCircular()->getElection()->getEndDate()->getTimestamp()
-                          < time()
-                ) {
+                } elseif ($electionInvitation->getElectionEndDateAsTimestamp() < time()) {
                     $this->addFlashMessage(
                         LocalizationUtility::translate('controller.fe.election.vote.election_finished', 'election'),
                         LocalizationUtility::translate('controller.fe.election.vote.request_failed', 'election'),

Classes/Domain/Model/ElectionInvitation.php

@@ -123,4 +123,12 @@ class ElectionInvitation extends AbstractEntity
     {
         $this->voted = $voted;
     }
+
+    /**
+     * @return int
+     */
+    public function getElectionEndDateAsTimestamp()
+    {
+        return $this->getElectionCircular()->getElection()->getEndDate()->getTimestamp();
+    }
 }