Artist Product Page
Design and Skin Customization
You could check to see if the quantity variable is set and has a greater value than 0, and if not just add a space so the line height is still there.
Maybe something like this:
{if isset($quantity) && $quantity > 0}
{$quantity}
{else}
& n b s p ;
{/if}
be sure to remove the spaces between & n b s p ;
updated by @douglas: 09/17/14 05:20:27AM