Fix possible warning on some misconfig

Aleksander Machniak

2013-04-29 d14a2fb8bc11df61d473d4e61822ca70dbea0ee3

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