Fix possible PHP warning: strpos(): Offset not contained in string

Aleksander Machniak

2012-06-04 aede1f9ab41e8dfc5272a149b1e88a464ce12f89

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