Victoria Disable Featured Image On Portfolio Posts w/ Slides

/******** OLD CODE *********/


<a href="<?php echo $full_size[0]; ?>" data-rel="prettyPhoto" title="">
<img src="<?php echo $thumbnail[0]; ?>" alt="" width="627" height="400" />
</a>


/******** New CODE *********/


<?php
//check if first slider meta is blank
if(get_post_meta($post->ID, 'victoria_portfolio_slider_1', true) =='') {
//if blank show featured image
?>
<a href="<?php echo $full_size[0]; ?>" data-rel="prettyPhoto" title="">
<img src="<?php echo $thumbnail[0]; ?>" alt="" width="627" height="400" />
</a>
<?php } ?>