app/views/collections/_collection.html.erb
<%- has_children = collection.subcollections.any? -%>
<li class="<%= has_children ? "hasChildren" : "" %>"
id="<%= collection.id %>"
data-has-children="<%= has_children %>"
>
<%= link_to collection.pref_label.to_s, collection_path(id: collection) %>
<%- if collection.additional_info -%>
<span class="additional_info">(<%= collection.additional_info %>)</span>
<%- end -%>
</li>