Fix error when using check_referer=true

Aleksander Machniak

2013-04-24 a544971fe81e47bcf79bae66ef5ef5592bce12e8

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