return empty list instead of None on tx_value address #393

	name: Test REST Interface

	on:
	push:
	branches:
	- master
	- develop
	- 'hotfix/**'
	- 'release/**'
	- 'feature/**'

	jobs:
	build:
	runs-on: ubuntu-20.04
	strategy:
	matrix:
	python-version:
	- '3.9'
	- '3.10'

	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install tox tox-gh-actions wheel
	pip install flake8
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	flake8 ./gsrest --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 ./gsrest --count --max-line-length=80 --statistics
	- name: Test with tox
	run: tox -- $GITHUB_REPOSITORY_OWNER

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