Fix bug where error was raised when all edges were removed #64

	name: Build docs

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- docs
	workflow_dispatch:

	jobs:

	build-and-upload-artifact:
	name: build
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install 'setuptools<50.0'
	python -m pip install .[testing,docs]

	- name: Build docs
	run: \|
	cd docs
	make html
	cd ..

	- name: Upload artifact
	uses: actions/upload-artifact@v2
	with:
	name: docs
	path: docs/_build/html

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