Revert change where NULL config value wasn't handled as unset (#1489202)

Aleksander Machniak

2013-06-24 2787fbe5b6f015b5ce7c86185cc6876ec892b483

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<?php
require_once 'Net/IDNA2/Exception.php';
 
class Net_IDNA2_Exception_Nameprep extends Net_IDNA2_Exception
{
}