problem to pass the data form form

<?php print $ajax->form(array('action' => '/user/register'), 
'post',array('update' => 'registerFormDiv'));?>
    <?php echo $html->input('User/nickname', array( 'type' => 
'text')).'<br>'.$error->messageFor('User/nickname'); ?>
    <?php echo  $html->submit('Register')?>
</form>

The problem is that if I leave the field blank the $this-data is null, I 
have to type something to have $this->data['User]['nickname'] not null
I checked  also with $this->params['data'] same thing.

my function

var $helpers = array('Javascript','Ajax');
var $components = array ('RequestHandler');

function register()
    {   
        $this->layout = 'ajax';
//        if (!empty($this->data['User']))
        if (!empty($this->params['data']['User']))
            {
             
---------------     if there is no data in field it does not get in to 
this point ------------------

            }
 
    }

thanks for help

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