Fix regression in displaying contents of message/rfc822 parts (#1490606)

Aleksander Machniak

2015-12-14 2382c6e822c5268fb6112ad5e8ab16f718112dae

 program/steps/mail/func.inc

@@ -1225,6 +1225,8 @@
                        $part = $msgpart;
                        $out .= html::div('message-partheaders', rcmail_message_headers(sizeof($header_attrib) ? $header_attrib : null, $part->headers));
                    }

                    $body = $part->body;
                }

                // message is cached but not exists (#1485443), or other error