Return empty purl fields in purl_to_lookups #128

	name: Python CI

	on: [push, pull_request]

	jobs:
	lint-and-mypy:
	name: Lint & mypy
	runs-on: ubuntu-latest
	timeout-minutes: 5
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Setup Python environment
	uses: actions/setup-python@v4
	with:
	python-version: "3.9"
	architecture: "x64"

	- name: Install
	run: \|
	pip install -e .[lint]

	- name: Validate
	run: \|
	isort --check-only src/ tests/
	black --check --line-length 100 .
	mypy

	build-and-test:
	name: Test & build (py${{ matrix.python-version }} on ${{ matrix.os }})
	runs-on: ${{ matrix.os }}
	timeout-minutes: 10
	strategy:
	matrix:
	os: [ubuntu-latest, windows-latest, macos-latest]
	python-version:
	- "3.11"
	- "3.10"
	- "3.9"
	- "3.8"
	- "3.7"

	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Setup Python environment
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	architecture: "x64"

	- name: Install
	run: \|
	pip install -e .[test]
	pip install -e .[build]

	- name: Test
	run: py.test -vvs

	- name: Build
	run: python setup.py build sdist bdist_wheel

Provide feedback