teuthology-queue --pause traceback w/o --machine-type

[zmc]

Example:

teuthworker@teuthology:~$ teuthology-queue --pause 99999
Traceback (most recent call last):
  File "/home/teuthworker/src/git.ceph.com_git_teuthology_main/virtualenv/bin/teuthology-queue", line 8, in <module>
    sys.exit(main())
  File "/home/teuthworker/src/git.ceph.com_git_teuthology_main/scripts/queue.py", line 36, in main
    teuthology.beanstalk.main(args)
  File "/home/teuthworker/src/git.ceph.com_git_teuthology_main/teuthology/beanstalk.py", line 202, in main
    pause_tube(connection, machine_type, pause_duration)
  File "/home/teuthworker/src/git.ceph.com_git_teuthology_main/teuthology/beanstalk.py", line 164, in pause_tube
    tubes = sorted(connection.tubes())
TypeError: '<' not supported between instances of 'NoneType' and 'str'