fix test_scopes.py (Empty scopes are None, not "") #1223

	name: Tests

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-20.04
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install .[test]
	- name: Lint with flake8
	run: \|
	pip install -Iv enum34==1.1.6 # https://bitbucket.org/stoneleaf/enum34/issues/27/enum34-118-broken
	pip install flake8
	flake8 . --count --show-source --statistics
	- name: Run unit tests
	run: \|
	python -m unittest discover -v tests/unit

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