jamesperet-website-2020/themes/james-theme/layout/_partial/content-thumbnail.ejs

<% var thumbnail %>
<% if(post.cover != undefined) thumbnail = post.cover %>
<% if(post.image != undefined) thumbnail = `/images/thumbnails/blog/${post.image.feature}` %>

<a href="<%= url_for(post.path) %>" class="">
    <img class="img-fluid thumbnail" src="<%= thumbnail %>">
    <p><%= post.title %></p>
</a>