Fix Fatal error after last commit

Aleksander Machniak

2015-07-02 70422cd7a227c2479a1889fecb533107e845ea31

 program/lib/Roundcube/rcube_ldap.php

@@ -836,6 +836,8 @@
                // map address book fields into ldap attributes
                $me         = $this;
                $attributes = array();
                $fields     = (array) $fields;

                array_walk($fields, function($field) use ($me, &$attributes) {
                    if ($me->coltypes[$field] && ($attrs = (array)$me->coltypes[$field]['attributes'])) {
                        $attributes = array_merge($attributes, $attrs);