Fix call to a member function get_compressed() on a non-object

Aleksander Machniak

2014-09-08 c489cc14797942fa8940e6451a964db875eb00a2

 program/lib/Roundcube/rcube_imap.php

@@ -1384,7 +1384,7 @@
    public function index_direct($folder, $sort_field = null, $sort_order = null, $search = null)
    {
        if (!empty($search)) {
            $search = $this->search_set->get_compressed();
            $search = $search->get_compressed();
        }

        // use message index sort as default sorting