This yields `:scripts` if it's defined ... which it will be in the case of

    <% content_for :scripts do %>
      <%= javascript_include_tag 'disqus' %>
    <% end %>

in [_disqus.html.erb](https://github.com/johnnymo87/WebsiteOne/blob/disqus/app/views/shared/_disqus.html.erb)