Likes are not correctly displayed on Cards blog post layout

When testing the feature introduced by the ticket BLOG-181 I noticed that the likes are not correctly displayed on the Cards blog post layout.

To reproduce :

• XWiki version 12.10.6
• Edit the Blog.WebHome page and set the Posts layout to 'Cards' and save the page

Expected results : The likes heart and the number of likes are displayed on the blog posts

Actual results : The likes heart are displayed but the number of likes is always null, see screenshot :  

The code responsible of displaying the likes number added to the Cards blog post layout (Blog.BlogPostLayoutCards) is : 

 #if ($services.like.displayButton($pDoc))
          #set ($optLikeRecord = $services.like.getLikes($pDoc))
          #set ($likeNumber = $optLikeRecord.get().likeNumber)
          <div class="like-button btn btn-default disabled badge"
            title="$escapetool.xml($services.localization.render('like.button.title', [$likeNumber]))">
            $services.icon.renderHTML('heart') <span class="like-number">$likeNumber</span>
          </div>
        #elseif ($services.ratings)
 

Note that this code #set ($optLikeRecord = $services.like.getLikes($pDoc)) returns an Optional<Long>, so the code used to get the likes number, (#set ($likeNumber = $optLikeRecord.get().likeNumber)), cannot work, see https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html.

So, $optLikeRecord.get() is enough to get the number of likes.

Another remark is that the code is not managing the case when the $services.like.getLikes() method returns an empty Optional instance.

Note that the $services.like.getLikes($pDoc) method takes an EntityReference as a parameter and the $pDoc variable is an xwiki Document.