browsermedia#665 do not show remove button for sections that cannot be removed from sitemap

Author: jamesprior

app/models/cms/section_node.rb

@@ -78,6 +78,10 @@ def page?
  def link?
  node_type == 'Cms::Link'
  end
+ 
+ def deletable?
+ !self.root? && (!section? || node.deletable?)
+ end
 
  # @param [Section] section
  # @param [Integer] position

app/views/cms/section_nodes/_row_buttons.html.erb

@@ -7,5 +7,5 @@
  <!--<li><%= link_to("Hide", "#", class: 'add-link') unless section_node.root? %></li>-->
  <li><%= link_to 'Remove', engine_aware_path(section_node.node),
  class: 'add-link http_delete confirm_with_title',
- title: "Are you sure you want to remove #{section_node.node.name}?" unless section_node.root? %></li>
+ title: "Are you sure you want to remove #{section_node.node.name}?" if section_node.deletable? %></li>
 </ul>