I have added this to a content template to only output the div if a featured image is set:
[wpv-conditional if="( '[wpv-post-featured-image]' ne '' )"]
<div class="album-review-cover">[wpv-post-featured-image size='medium']</div>
[/wpv-conditional]
However when this is on the template the front end page using the layout that uses this content template will not load, it just hangs and stays loading forever. I have used these conditionals to check other fields and it works ok.
Here is the full template code. If I delete the code above from it then page loads. If it's present then it does not: