lib/metro/scenes.rb
def hash_with_missing_scene_default
      hash = HashWithIndifferentAccess.new do |hash,key|
        missing_scene = hash[:missing_scene].constantize
        missing_scene.missing_scene = key.to_sym
        missing_scene
      end
      hash[:missing_scene] = "Metro::MissingScene"
      hash
    end
def hash_with_missing_scene_default
      hash = HashWithIndifferentAccess.new do |hash,key|
        missing_scene = hash[:missing_scene].constantize
        missing_scene.missing_scene = key.to_sym
        missing_scene
      end
      hash[:missing_scene] = "Metro::MissingScene"
      hash
    end
Create a hash that will return a setup missing scene by default.