title: Shopify check if Metafield exists?
body: <p>I'm looking to hide content if the metafields are empty for a product, but right now it's returning it for all pages which means my if statement is broken somewhere. </p>
  
  <p><strong>Product Page</strong></p>
  
  <pre><code>{% if product.metafields.review %}
    {% include 'extra-review' %}
  {% else %}
  {% endif %}
  </code></pre>
  
  <p><strong>Review Snippet Page (extra-review.liquid)</strong></p>
  
  <pre><code>{% assign review = product.metafields.review %}
  {% assign key = 'author' %}
  {% assign key = 'author-img' %}
  {% assign key = 'long' %}
  
  &lt;p&gt; Hello world &lt;/p&gt;
  </code></pre>
  
  <p>Any help would be brilliant</p>
  
  <p>EDIT</p>
  
  <p>Added review metafields layout</p>
  
  <p><a href="https://i.stack.imgur.com/CvyYt.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CvyYt.png" alt="enter image description here"></a></p>