CLI app-create fails with null artifact name

[Ed Cranford]

vagrant@devstack:~$ cat blah.yaml
version: 1
name:
description: Sample Python web app.
artifacts:
- name:
  content:
    href: https://github.com/rackspace-solum-samples/solum-python-sample-app.git
  language_pack: python27
  unittest_cmd: pip install -r test-requirements.txt; pep8 app.py
  run_cmd: ./main.sh
  ports: 80

vagrant@devstack:~$ solum app create --plan-file blah.yaml
Please name the application.
> blah
ERROR: expected string or buffer

Cryptic! In debugging it's because the artifact name is there, but it's null, and re.match(needle, haystack) during lpname-is-valid doesn't like trying to work with null haystacks.