I created a custom field with CustomPress and inserted it

Hi, I created a custom field with CustomPress and inserted it into my theme as seen below.

I've tried several 'if' statements trying to hide the whole thing if the custom field is left empty but can't figure out how to get that to work.

What is the proper way to get this to show only when the custom field has text in it?

Thanks,
Jessica

add_action( 'genesis_entry_content', 'purchase_links', 10 );
function purchase_links() {
if ( is_single()){
	?>
		<div class="purchase"><h1>Purchase</h1><div class="purchase-links">
	<?php echo do_shortcode('[ct id="ct_Purchase_L_textarea_0527" property="title | description | value"]');?>
		</div></div>
<?php
}
}