Hiding empty categories

I'm on CakePHP 1.3

On my products/index.ctp view I show a menu of categories and list all the products from the selected category. However I don't want to show categories where there are no products.

Currently the data comes from my products_controller.php

function index($id = 1) {
$this->Product->recursive = 0;
$this->set('currentcategory', $id);
$this->set('products', $this->Product->find('all', array('conditions' => array('ProductCategory.id' => $id))));
$this->set('categories', $this->Product->ProductCategory->find('list', array('fields' => array('ProductCategory.id', 'ProductCategory.name'))));
}

What is the best way to only find those categories with products?

Cheers

Paul

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