Fix error when spell-checking an empty text (#1489831)

Aleksander Machniak

2014-04-25 7fface125e7db1e7ab47bdfbda5306fa16ea2486

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