not_set_required_variables() private

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# File lib/rss/maker/feed.rb, line 64
          def not_set_required_variables
            vars = super
            if authors.empty? and
                @maker.items.all? {|item| item.author.to_s.empty?}
              vars << "author"
            end
            vars << "title" unless title {|t| t.have_required_values?}
            vars
          end
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