underscore-template-conditional.js

// If URL is available URL link the image
// Otherwise just display the image
<% if ( instagram_link_url ) { %> <a href="<%= instagram_link_url %>" target="_blank"> <% } %>
    <img src="<%= url %>" alt="<%= username %>" />
<% if ( instagram_link_url ) { %> </a> <% } %>

// Example 2 - Check if formated date
<% if (typeof(date) != "undefined") { %>
    <span class="date"><%= date %></span>
<% } %>