890.3 Fixed regression introduced in commit 4870 - fatal error during a MTP from the designer

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@4874 a333f486-631f-4898-b8df-5754b55c2be0

core/userrights.class.inc.php

@@ -161,6 +161,7 @@ abstract class UserRightsAddOnAPI
 }
 
 
+require_once(APPROOT.'/application/cmdbabstract.class.inc.php');
 abstract class User extends cmdbAbstractObject
 {
 	public static function Init()