Allow package declared and concluded licenses to be NONE or NOASSERTION
Allow package declared and concluded licenses to be NONE or NOASSERTION

https://spdx.org/spdx-specification-21-web-version#h.ihv636
https://spdx.org/spdx-specification-21-web-version#h.1hmsyys

spdx/tools-python,bmwcarit/spdx-tools-python