Change np.average to np.ma.average to properly handle cases with zero… #321

	# Runs all tests
	name: Tests

	defaults:
	run:
	shell: bash

	on: # Runs on all push events to any branch
	push:

	jobs:
	tests:
	name: ${{ matrix.os }} / ${{ matrix.python-version }}
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-22.04, ubuntu-24.04, windows-latest, macos-latest]
	python-version: [3.9, "3.10", 3.11, 3.12]

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	cache-dependency-path: '**/pyproject.toml'

	- name: Upgrade pip, setuptools and wheel
	run: \|
	python -m pip install --upgrade pip
	pip install setuptools wheel

	- name: Install package
	run: pip install '.[test]'

	- name: Run tests
	run: python -m pytest

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