Exception unable to read the configuration (matrix_base_dir in .condarc)

[bkreider]

If you don't run c3i bootstrap, this exception is raised when running commands:

Traceback (most recent call last):
  File "/opt/anaconda/envs/c3i-devel/bin/c3i", line 33, in <module>
    sys.exit(load_entry_point('conda-concourse-ci', 'console_scripts', 'c3i')())
  File "/opt/anaconda/envs/c3i-devel/lib/python3.6/site-packages/conda_concourse_ci-0.1.0-py3.6.egg/conda_concourse_ci/cli.py", line 285, in main
    execute.submit_one_off(pass_throughs=pass_throughs, **args.__dict__)
  File "/opt/anaconda/envs/c3i-devel/lib/python3.6/site-packages/conda_concourse_ci-0.1.0-py3.6.egg/conda_concourse_ci/execute.py", line 759, in submit_one_off
    config_root_dir = os.path.expanduser(config_root_dir)
  File "/opt/anaconda/envs/c3i-devel/lib/python3.6/posixpath.py", line 235, in expanduser
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType