    # File lib/chef/knife/cookbook_delete.rb, line 72
          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