[fw-db] weird Zend_Db_Table_Abstract behaviour

Hello,
I don't know why, but when I call the method below and there's nothing to
update (datas are not changed) it returns false... I mean is this normal?
Even if datas are not changed I would expect a successful result of the
update operation... it simply would update nothing!!

class Model_DbTable_Users extends Zend_Db_Table_Abstract
{
protected $_name = 'users';
protected $_primary = 'id_user';

....

public function updateData($data, $id)
{
$id = (int)$id;
if($this->update($data, "id_user = " . $id))
{
return true;
}
return false;
}

...

}

Maybe the problem could be NOT NULL fileds in the db?
I know, would be better to include the update code in a try/catch statement,
but I want to hear your opinion on this weird behaviour.

Thanks
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