Fix SR if `SpacingBetweenSlices` is not set #529

	# This workflow will install Python dependencies, run tests and lint with a single version of Python
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: unit tests

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.10", "3.11", "3.12"]
	dependencies: [".", "'.[libjpeg]'"]

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip setuptools
	pip install .[test]
	pip install ${{ matrix.dependencies }}
	- name: Lint with flake8
	run: \|
	flake8 --exclude='bin,build,.eggs,src/highdicom/_*'
	- name: Test with pytest
	run: \|
	pytest --cov=highdicom --cov-fail-under=80

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