Hide Cart Contents

[jgkiefer]

In header.php I am using a code snippet to only display the cart contents is the user is logged in. This works very well. I overlooked the fact that items can be added to the cart without logging in. How would I set the code to if cart total =0 instead of if regestered?

 

<?php if (tep_session_is_registered('customer_id')) { ?>