bourbaki cli raises AttributeError when calling a subcommand that expects additional subcommands or flags

[petergaultney]

└─> 22:15:49  rr mono dag
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/peter.gaultney/work/ds-monorepo/.venv/lib/python3.8/site-packages/bourbaki/application/cli/main.py", line 1019, in run
    if cmdfunc.exit_codes is None:
AttributeError: 'NoneType' object has no attribute 'exit_codes'

As a user I think I would expect this to automagically print the help for this subcommand.