gather_files returns empty data frame if target doesn't exist #1

	name: Upload Python Package

	on:
	release:
	types: [ created ]

	jobs:
	deploy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'
	- name: Determine version from git tag
	id: version
	run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
	- name: set version
	run: \|
	echo "__version__ = \"${{ steps.version.outputs.tag }}\"" > src/eotransform_pandas/_version.py
	- name: Push changes
	run: \|
	git config --local user.email "action@github.com"
	git config --local user.name "GitHub Action"
	git commit -m "e update version tag: ${{ steps.version.outputs.tag }}" -a \|\| echo "nothing to commit"
	git checkout -b temp
	git fetch
	git checkout main
	git merge temp
	remote="https://${GITHUB_ACTOR}:${{secrets.GITHUB_TOKEN}}@github.com/${GITHUB_REPOSITORY}.git"
	branch="main"
	git push "${remote}" ${branch} \|\| echo "nothing to push"
	shell: bash
	- name: Build and publish
	env:
	TWINE_USERNAME: __token__
	TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
	run: \|
	make dist
	python3 -m twine upload dist/*
	rm -r dist

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