fix(witness): witness should not error on an empty git repo with no commits #193

	# Copyright 2022 The Witness Contributors
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Verify License
	on:
	workflow_dispatch:
	push:
	branches: ['main', 'release-*']
	pull_request:
	jobs:
	license-check:
	name: license boilerplate check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-go@v2
	with:
	go-version: '1.17.x'
	- name: Install addlicense
	run: go install github.com/google/addlicense@latest
	- name: Check license headers
	run: \|
	set -e
	addlicense --check -l apache -c 'The Witness Contributors' -v *

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