# File lib/nanoc/helpers/blogging.rb, line 109
      def validate_articles
        if relevant_articles.empty?
          raise Nanoc::Errors::GenericTrivial.new('Cannot build Atom feed: no articles')
        end
        if relevant_articles.any? { |a| a[:created_at].nil? }
          raise Nanoc::Errors::GenericTrivial.new('Cannot build Atom feed: one or more articles lack created_at')
        end
      end