title: Hide "out of stock" products with custom meta data In Woocommerce
body: <p>I'm working on a WooCommerce webshop at the moment and I've added a custom meta field named <code>external_stock</code> where WP All Import imports the stock that is available at our supplier for all of our products every 3 hours. The amount of products we've got in our actual store is being entered in the normal stock field. </p>
  
  <p>What I'm trying to achieve is that the products from which the normal stock and the <code>external_stock</code> are both 0 are not being displayed in the webshop. </p>
  
  <p>I've already edited a plugin in a way that whenever our stock is 0 but the external stock is > 0 the product page displays 'Available within x days' and when both stocks are 0 it will display 'Out Of Stock', but customers can still order the 'Out Of Stock' products, and that's why I want to hide them.</p>