title: Show Message in Woocommerce Cart only for specific product variation Attribute
body: <p>I am adding a custom message to the Cart page, but so that it only appears if an added product has a custom variation atribute selected.</p>
  
  <p>After researching I came up to:</p>
  
  <pre><code>add_action( 'woocommerce_after_cart', 'wnd_after_cart' ); 
  function wnd_after_cart() { 
      if($attribute_slug == 'no_review'){ 
          echo '&lt;div class="wnd_after_cart"&gt;&lt;h4&gt;There will be no item manual review&lt;/h4&gt;&lt;br /&gt; &lt;/div&gt;';
      }
  }
  </code></pre>
  
  <p>But its not working. Does anyone know what am I doing wrong?</p>
  
  <pre><code>add_action( 'woocommerce_after_cart', 'wnd_after_cart' ); 
  function wnd_after_cart() { 
      echo '&lt;div class="wnd_after_cart"&gt;&lt;h4&gt;There will be no item manual review&lt;/h4&gt;&lt;br /&gt; &lt;/div&gt;'; 
  }
  </code></pre>
  
  <p>Works very well, but I can't get the code to display the message only IF my custom attribute is selected.</p>
  
  <p>Any help is appreciated…</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>I set my product Atributes (example:Shirt size, Slug:'Shirt_Size') , and their variations within this atribute (Example: S (Slug:'Size_S'), M(Slug:'Size_M'), XL(Slug:'Size_XL') )</p>
  
  <p>I'm trying to display the message when a specific Attribute Variation is selected (Example: The slug for S, 'Size_S')</p>
  
  <p>I'm using clothes/shirt sizes since its a more common example to help illustrate.</p>
  
  <p>In case I didn't explain very well, basically the code is searching for the attribute slug that you can see here in this video at 0:23 
  <a href="https://www.youtube.com/watch?v=QyMuq-WkV0o" rel="nofollow noreferrer">https://www.youtube.com/watch?v=QyMuq-WkV0o</a></p>
  
  <p>But I'm trying to make it search for the slugs of the attribute variations that can be seen at 0:35 
  (the attribute attributes, or attribute variations, or attribute childs, I'm not sure what to name them)</p>
  
  <p>@LoicTheAztec code seems to be working very well, but it's searching for the slug of the attribute (Shirt_Size), and not for the attribute variations shown previosly. 
  When I set the code to find 'Shirt_size', it will disply the message, but when I set it to find 'Size_S', it stops working.</p>
  
  <p>Did this make sense?
  Thank you for the attention and advice once again.</p>