Fix error detection when parsing `extra_filetype` #645

	name: tests

	on: [push, pull_request]

	jobs:
	pytest:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	sudo apt update && sudo apt install -y python3-graphviz
	python -m pip install --upgrade pip
	pip install .[tests]
	- name: Test with pytest
	run: \|
	pytest -vv

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