Do not assume that a User is linked to a Person !

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@964 a333f486-631f-4898-b8df-5754b55c2be0

core/userrights.class.inc.php

@@ -493,6 +493,10 @@ class UserRights
 		{
 			return '';
 		}
+		if (!MetaModel::IsValidAttCode(get_class($oUser), 'contactid'))
+		{
+			return '';
+		}
 		return $oUser->Get('contactid');
 	}