bin/middleman in middleman-cli-4.1.12 vs bin/middleman in middleman-cli-4.1.13

@@ -23,15 +23,13 @@
   def self.import_config(base)
     ::Middleman::Cli.config.all_settings.each do |setting|
       if setting.default.is_a?(String) || setting.default.is_a?(NilClass)
         base.class_option setting.key,
                           type: :string,
-                          default: :undefined,
                           desc: setting.description
       elsif setting.default.is_a?(TrueClass) || setting.default.is_a?(FalseClass)
         base.class_option setting.key,
                           type: :boolean,
-                          default: :undefined,
                           desc: setting.description
       end
     end
   end
 end