def clean_directories!
      all_build_files = File.join(@app.config[:build_dir], '**', '*')

      empty_directories = Dir[all_build_files].select do |d|
        File.directory?(d)
      end

      empty_directories.each do |d|
        remove_file d, force: true if Pathname(d).children.empty?
      end
    end
def clean_directories!
      all_build_files = File.join(@app.config[:build_dir], '**', '*')

      empty_directories = Dir[all_build_files].select do |d|
        File.directory?(d)
      end

      empty_directories.each do |d|
        remove_file d, force: true if Pathname(d).children.empty?
      end
    end
Find empty directories in the build folder and remove them.
 @return [Boolean]