Fix PLAIN authentication for some IMAP servers (#1488674)

Aleksander Machniak

2012-09-09 4e383e2ec8b4184c0fe74d02cf30fd3a4078128e

 program/include/rcube_imap.php

@@ -2222,6 +2222,10 @@
            $folder = $this->folder;
        }

        if (!$this->check_connection()) {
            return false;
        }

        // make sure folder exists
        if ($this->folder_exists($folder)) {
            if ($is_file) {