[TASK] Adding categories to the view

Classes/Controller/BackendController.php

@@ -75,9 +75,10 @@ class BackendController extends ActionController {
 
 		// retrieve next site root id
 		$siteRootId = Utility::getSiteRoot((int) GeneralUtility::_GP('id'));
-		Utility::getCategoriesForSiteRoot($siteRootId);
+		$categories = Utility::getCategoriesForSiteRoot($siteRootId);
 
 		$this->view->assign('docHeader', $this->docHeaderComponent->docHeaderContent());
 		$this->view->assign('pageUid', $pageUid);
+		$this->view->assign('categories', $categories);
 	}
 }