Missing/inaccessible dns zone in DO not gracefully detected

[louis-reid]

After creating the droplet, throws an exception:

  File "/home/user/.shiv/machine_329452bc7e33e0c16f73d4584fbc07656468d6ab53b95adde6eb4696a2047b82/site-packages/machine/subcommands/create.py", line 112, in command
    record = domain.create_new_domain_record(
  File "/home/user/.shiv/machine_329452bc7e33e0c16f73d4584fbc07656468d6ab53b95adde6eb4696a2047b82/site-packages/digitalocean/Domain.py", line 86, in create_new_domain_record
    return self.get_data(
  File "/home/user/.shiv/machine_329452bc7e33e0c16f73d4584fbc07656468d6ab53b95adde6eb4696a2047b82/site-packages/digitalocean/baseapi.py", line 221, in get_data
    raise NotFoundError()
digitalocean.NotFoundError