only try to clear lines, if there are already artists in the axes. #387

	name: static analysis
	on:
	push:
	pull_request:
	# Run every Monday at 6am UTC
	schedule:
	- cron: '0 6 * * 1'

	jobs:
	pre-commit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v4
	with:
	python-version: 3.x
	- name: Lint
	uses: pre-commit/[email protected]
	with:
	extra_args: --all-files --show-diff-on-failure

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