conda debug fails when called on a path without trailing slash on Windows

[tobijk]

I ran

conda debug C:\Users\builder\tkoch\git\aggregate\python-3.7-feedstock

which resulted in

...
Traceback (most recent call last):
  File "C:\MC3_x64\Scripts\conda-debug-script.py", line 10, in <module>
    sys.exit(main())
  File "C:\MC3_x64\lib\site-packages\conda_build\cli\main_debug.py", line 93, in main
    return execute(sys.argv[1:])
  File "C:\MC3_x64\lib\site-packages\conda_build\cli\main_debug.py", line 69, in execute
    activation_string = api.debug(thing_to_debug, verbose=(not _args.activate_string_only), **_args.__dict__)
  File "C:\MC3_x64\lib\site-packages\conda_build\api.py", line 410, in debug
    os.path.isdir(recipe_or_package_path_or_metadata_tuples) else [])
  File "C:\MC3_x64\lib\genericpath.py", line 42, in isdir
    st = os.stat(s)
TypeError: stat: path should be string, bytes, os.PathLike or integer, not list

The expected result would have been for conda debug to realize that I was pointing it at a feedstock directory.

However, it worked when I added a trailing \.