...or even better:
try {
if ($this->Category->delete($id)) {
$this->Session->setFlash('Category has been deleted');
$this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash('Unknown error');
}
} catch (NotEmptyCategoryException $e) {
$this->Session->setFlash('This category is not empty');
}
$this->redirect($this->referer());
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