infinite recursion on Windows

[pombredanne]

Description

See https://ci.appveyor.com/project/nexB/scancode-toolkit/builds/24389675/job/0l6svxksrctojrrs

tests\scancode\test_resource.py:1203: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
src\scancode\resource.py:1380: in __init__
    self._populate(scan_data)
src\scancode\resource.py:1591: in _populate
    parent = self._get_or_create_parent(path, parent_by_path)
src\scancode\resource.py:1460: in _get_or_create_parent
    parent_parent = self._get_or_create_parent(parent_path, parent_by_path)
src\scancode\resource.py:1460: in _get_or_create_parent
    parent_parent = self._get_or_create_parent(parent_path, parent_by_path)
src\scancode\resource.py:1460: in _get_or_create_parent
    parent_parent = self._get_or_create_parent(parent_path, parent_by_path)
src\scancode\resource.py:1460: in _get_or_create_parent
    parent_parent = self._get_or_create_parent(parent_path, parent_by_path)
E   RuntimeError: maximum recursion depth exceeded
!!! Recursion detected (same locals & position)
=========================== short test summary info ===========================
FAIL tests/scancode/test_cli.py::test_scan_should_not_fail_on_faulty_pdf_or_pdfminer_bug_but_instead_report_errors_and_keep_trucking_with_html
FAIL tests/scancode/test_cli.py::test_merge_multiple_scans
FAIL tests/scancode/test_resource.py::TestVirtualCodebaseCreation::test_VirtualCodebase_create_from_multiple_scans
SKIP [1] c:\projects\scancode-toolkit\lib\site-packages\_pytest\nose.py:23: This test cannot run on windows as these are not legal file names.
SKIP [1] c:\projects\scancode-toolkit\lib\site-packages\_pytest\nose.py:23: Python tar cannot extract these files on Windows

@JonoYang do you mind to look into it since you likely introduced this with #1439 #1543 👼

[JonoYang]

This has been fixed