Fresh run of syntribos after install throws error

When syntribos is installed in a environment, fresh for the first time and there is no config file, no `.syntribos` directory and no virtual environment, if a user runs `syntribos` , the tool throws an error:

ERROR:syntribos.config:[Errno 2] No such file or directory
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/syntribos/runner.py", line 130, in setup_config
    default_config_files=[ENV.get_default_conf_file()])
  File "/usr/local/lib/python2.7/dist-packages/syntribos/utils/env.py", line 89, in get_default_conf_file
    return get_syntribos_path(FILE)
  File "/usr/local/lib/python2.7/dist-packages/syntribos/utils/env.py", line 84, in get_syntribos_path
    return os.path.abspath(os.path.join(get_syntribos_root(), *args))
  File "/usr/local/lib/python2.7/dist-packages/syntribos/utils/env.py", line 70, in get_syntribos_root
    home_root = get_user_home_root()
  File "/usr/local/lib/python2.7/dist-packages/syntribos/utils/env.py", line 45, in get_user_home_root
    user = os.getlogin() or os.environ.get("USER")
OSError: [Errno 2] No such file or directory
Traceback (most recent call last):
  File "/usr/local/bin/syntribos", line 10, in <module>
    sys.exit(entry_point())
  File "/usr/local/lib/python2.7/dist-packages/syntribos/runner.py", line 404, in entry_point
    Runner.run()
  File "/usr/local/lib/python2.7/dist-packages/syntribos/runner.py", line 172, in run
    if CONF.sub_command.name == "init":
  File "/usr/local/lib/python2.7/dist-packages/oslo_config/cfg.py", line 3163, in __getattr__
    return getattr(self._conf._namespace, name)
AttributeError: 'NoneType' object has no attribute 'sub_command'