fix ntue sub menu link target

app/views/front/show_page_sub_menu.html.erb

@@ -4,7 +4,7 @@
     <ul class='list'>
       <% @menu_page.visible_children.each do |child| %>
         <li class="<%= @page_id.eql?(child.id) ? 'active' : nil %>">
-          <a href="<%= (child.class.to_s.eql?('Page') ? '/' + child.path : child.url) %>"><%= child.title %></a>
+          <a href="<%= (child.class.to_s.eql?('Page') ? '/' + child.path : child.url) %>" <%= "target=_blank" if child.class.to_s.eql?('Page').blank? %> ><%= child.title %></a>
         </li>
       <% end %>
     </ul>