SECURITY: Do not show latest/top topics on 404 for login_required sites

app/views/exceptions/not_found.html.erb

@@ -2,6 +2,7 @@
 
 <h1 class="page-not-found"><%= t 'page_not_found.title' %></h1>
 
+<% unless SiteSetting.login_required? && current_user.nil? %>
   <div class="row page-not-found-topics">
     <div class="span8 popular-topics">
       <h2 class="popular-topics-title"><%= t 'page_not_found.popular_topics' %></h2>
@@ -24,6 +25,7 @@
       <a href="<%= path "/latest" %>" class="btn"><%= t 'page_not_found.see_more' %>&hellip;</a>
     </div>
   </div>
+<% end %>
 
 <%- unless @hide_google %>
   <div class="row">