Explicitly call the content item

This is needed for atom feeds, otherwise the content item is not set.
Should probably make this a "before_action" in the content item
controller.

app/controllers/travel_advice_controller.rb

@@ -18,6 +18,7 @@ def index
   end
 
   def show
+    @content_item = content_item
     @content_item.set_current_part(params[:slug])
     @travel_advice_presenter = TravelAdvicePresenter.new(@content_item)