TypeError: argument should be a str or an os.PathLike object where __fspath__ returns a str, not 'NoneType'

[skupr-anaconda]

I tried to run percy aggregate downstream -f "$PACKAGE_NAME-feedstock" and got an error:

Traceback (most recent call last):
  File "/miniconda3/envs/percy/bin/percy", line 10, in <module>
    sys.exit(cli())
             ^^^^^
  File "//miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 1685, in invoke
    super().invoke(ctx)
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/percy/commands/aggregate.py", line 219, in aggregate
    aggregate_path = get_configured_aggregate(aggregate)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/site-packages/percy/commands/aggregate.py", line 32, in get_configured_aggregate
    return Path(cmd_line)
           ^^^^^^^^^^^^^^
  File "/miniconda3/envs/percy/lib/python3.12/pathlib.py", line 1162, in __init__
    super().__init__(*args)
  File "/miniconda3/envs/percy/lib/python3.12/pathlib.py", line 373, in __init__
    raise TypeError(
TypeError: argument should be a str or an os.PathLike object where __fspath__ returns a str, not 'NoneType'

cmd_line should be str or an os.PathLike object.