Dont return empty array on filters #1398

	# SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>
	#
	# SPDX-License-Identifier: MPL-2.0


	name: Check Code Quality

	on:
	push:
	branches:
	- main
	# run pipeline on pull request
	pull_request:
	# run pipeline on merge queue
	merge_group:

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	check-code-quality:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: 3.11

	- name: Upgrade pip
	run: pip install --upgrade pip

	- name: Install and run isort
	run: \|
	pip install isort
	isort .

	- name: Install and run black
	run: \|
	pip install black
	black .

	- name: Install and run mypy
	run: \|
	pip install mypy
	mypy src

	- name: Install and run pylint
	run: \|
	pip install pylint .
	pylint power_grid_model_io

Provide feedback