prevent call to htmlspecialchars on null value #46

	name: Tests
	on: pull_request
	jobs:
	phpunit:
	name: PHP ${{ matrix.php }}
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php:
	- "5.3"
	- "5.4"
	- "5.5"
	- "5.6"
	- "7.0"
	- "7.1"
	- "7.2"
	- "7.3"
	- "7.4"
	- "8.0"
	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Install pdftk
	run: \|
	cd /tmp
	sudo wget http://mirrors.kernel.org/ubuntu/pool/universe/p/pdftk-java/pdftk-java_3.0.9-1_all.deb
	sudo apt install -y -q ./pdftk-java_3.0.9-1_all.deb
	pdftk --version

	- name: Install PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	tools: composer:v2

	- name: Update composer
	run: composer self-update

	- name: Get composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"

	- name: Cache composer cache
	uses: actions/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install composer packages
	run: composer update --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi

	- name: Run phpunit
	run: vendor/bin/phpunit --color=always

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