Guard against nil items and holdings #1248

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby: [jruby-9.4.2.0, '3.2']
	steps:
	- uses: actions/checkout@v3
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	- name: Install dependencies
	run: bundle install --without production
	- name: Run tests
	run: bundle exec rake

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