Return a singleton iterator when the array is empty #35

	name: CI
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	jobs:
	build:
	strategy:
	matrix:
	java: [ 8, 11, 17, 21 ] # Test against Java LTS releases
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: gradle/wrapper-validation-action@v2

	- name: Setup JDK ${{ matrix.java }}
	uses: actions/setup-java@v4
	with:
	java-version: ${{ matrix.java }}
	distribution: 'adopt'

	- name: Setup Gradle
	uses: gradle/gradle-build-action@v3

	- name: Generate code
	run: ./gradlew generateCode --no-daemon

	- name: Check for changes in generated code
	id: diff
	run: \|
	git diff --exit-code >/dev/null 2>&1

	- name: Fail if submission doesn't include the latest generated code
	if: ${{ always() && steps.diff.outcome != 'success' }}
	run: \|
	echo "Generated files changed. Run './gradlew generateCode' after changing the code generators and include the updated files with your submission."
	exit 1

	- name: Build & run tests
	run: ./gradlew build --no-daemon

	- name: Upload test report if failed
	if: failure() # Only upload the build report if the previous step failed
	uses: actions/upload-artifact@v4
	with:
	name: Test report
	path: \|
	*/build/reports/tests/test/
	build/reports/tests/test/*

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