fix: crash when only one available storage class #643

	on: [push, pull_request]
	name: Test Build
	jobs:
	build-on-linux:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ github.ref }}
	- uses: actions/setup-node@v1
	with:
	node-version: '16.x'
	- name: install wine
	# https://github.com/actions/virtual-environments/issues/4589
	run: \|
	sudo dpkg --add-architecture i386
	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 86B72ED9
	sudo add-apt-repository 'deb [arch=amd64] https://mirror.mxe.cc/repos/apt focal main'
	sudo rm -f /etc/apt/sources.list.d/microsoft-prod.list
	sudo apt -qq update
	sudo apt install -yqq --allow-downgrades libgd3/focal libpcre2-8-0/focal libpcre2-16-0/focal libpcre2-32-0/focal libpcre2-posix2/focal
	sudo apt purge -yqq libmono* mono* php* libgdiplus libpcre2-posix3
	sudo apt install -y wine32 wine64
	- name: test
	run: make i test
	- name: build
	run: make linux32 linux64 win32 win64
	build-on-mac:
	runs-on: macos-latest
	steps:
	- uses: actions/checkout@v2
	with:
	ref: ${{ github.ref }}
	- uses: actions/setup-node@v1
	with:
	node-version: '16.x'
	- name: test
	run: make i test
	- name: build
	env:
	NODE_OPTIONS: "--max_old_space_size=4096"
	run: make mac

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