Handle null `closed_by` fields #81

	name: Smoke Test

	on:
	- push
	- pull_request

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- name: Check out repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '^3.10'

	- name: Install solidation
	run: python -m pip install .

	- name: Run solidation
	run: solidation -c solidation.yaml
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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