Fix issue where subject input might get filled with "null" string (IE8)

Aleksander Machniak

2013-11-21 b7fb20af3a5c98f291204befdb616fdf5daa22fb

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