# File lib/chef/knife/cookbook_delete.rb, line 68
      def delete_without_explicit_version
        if available_versions.nil?
          # we already logged an error or 2 about it, so just bail
          exit(1)
        elsif available_versions.size == 1
          @version = available_versions.first
          delete_explicit_version
        else
          versions_to_delete = ask_which_versions_to_delete
          delete_versions_without_confirmation(versions_to_delete)
        end
      end