Fix possible error on ajax request

Aleksander Machniak

2013-05-09 2a3e774c60b10e9593b5a3f9596fa68f1f389d86

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';