pyinfra: pyinfra error: No such group: __file__

Describe the bug

Simple ad-hoc command failed with error. I didn’t create inventory file, just run this ad-hoc command from bash shell in any directory.

$ pyinfra --debug --user=root 192.168.0.115 exec -- echo
--> Loading config...
--> Loading inventory...
    [pyinfra_cli.inventory] Creating fake inventory...

--> Connecting to hosts...
    [pyinfra.api.connectors.ssh] Connecting to: 192.168.0.115 ({'allow_agent': True, 'look_for_keys': True, 'username': 'root', 'timeout': 10})
    [192.168.0.115] Connected
    [pyinfra.api.state] Activating host: 192.168.0.115
    Use of Inventory.<group_name> is deprecated, please use `Inventory.get_group` instead.
--> pyinfra error: No such group: __file__

Meta

• Include output of pyinfra --support.

OS: macOS 10.15.5

$ pyinfra --support
--> Support information:

    If you are having issues with pyinfra or wish to make feature requests, please
    check out the GitHub issues at https://github.com/Fizzadar/pyinfra/issues .
    When adding an issue, be sure to include the following:

    System: Darwin
      Platform: Darwin-19.5.0-x86_64-i386-64bit
      Release: 19.5.0
      Machine: x86_64
    pyinfra: v0.14.5
    Executable: /usr/local/bin/pyinfra
    Python: 3.7.3 (CPython, Clang 11.0.3 (clang-1103.0.32.62))

• How was pyinfra installed (source/pip)?

pip.