Edit function not giving the results I expected.

I have just noticed something while working on an app, I use the
following code as part of an edit function (which I believe is the
"Cake" way:

if (!$id && empty($this->data)) {
$this->Session->setFlash(__('Invalid Product', true));
$this->redirect(array('controller' => 'products',
'action'=>'index'));
}

I thought the result of this would be if a user trys to access /edit/
foo (foo does not exist) then they would be redirect and shown an
error message.

What actually happens, is that the form appears with no data in it and
the form actions to "/edit".

I have checked a few other cake apps and it appears to be the case
with them as well.

It is a minor point, but I'm just wondering if I have to add something
else, I'm guessing it is because /edit/$id serves as a catch all, and
technically an ID is set...

Any ideas?

Thanks in advance!
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