add types for list vars with empty initial value #609

	name: "mdformat"

	on:
	push:
	pull_request:
	# The branches below must be a subset of the branches above
	schedule:
	- cron: "33 1 * * 3"

	jobs:
	mdformat:
	name: "Markdown format checking"
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Set up Python 3.11
	uses: actions/setup-python@v4
	with:
	python-version: 3.11
	- name: cd and ls
	run: \|
	cd ${{ github.workspace }}
	ls -l
	- name: Download dependencies
	run: \|
	python -m pip install mdformat==0.7.18
	- name: Format .md files
	run: \|
	find . -name '*.md' \| xargs mdformat
	- name: Check for changes
	run: \|
	CHANGES=$(git diff --name-only HEAD --)
	if [ -n "$CHANGES" ] ; then
	echo "There are changes after running mdformat:"
	echo "$CHANGES"
	git diff
	exit 1
	fi

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