Combining conditional checks for aclUsers.

Controller/CRUDController.php

@@ -770,10 +770,8 @@ class CRUDController extends Controller
 
         $this->admin->setSubject($object);
         $aclUsers = $this->getAclUsers();
-        if (is_object($aclUsers)) {
-             if (method_exists($aclUsers, 'toArray')) {
-                 $aclUsers = $aclUsers->toArray();
-             }
+        if (is_object($aclUsers) && method_exists($aclUsers, 'toArray')) {
+            $aclUsers = $aclUsers->toArray();
         }
 
         $adminObjectAclManipulator = $this->get('sonata.admin.object.manipulator.acl.admin');