Don't crash on contracts with no sender specific message #663

	name: Validate python syntax

	on: [push, pull_request]

	jobs:
	validate:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.9]

	steps:
	- 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 pycodestyle==2.6.0
	- name: Validate with pycodestyle
	run: \|
	pycodestyle
	- name: Make sure there are no missing migrations
	run: \|
	echo "SECRET_KEY='foobar'" > postgresqleu/local_settings.py
	echo "DATABASES={'default': {}}" >> postgresqleu/local_settings.py
	pip install Pillow pycryptodomex # Install the "wrong" version of pillow and pycryptodomex so it uses a wheel - since we won't actually call it anyway
	pip install -r <(grep -Ev "Pillow\|pycryptodomex" tools/devsetup/dev_requirements.txt)
	python manage.py makemigrations --check --dry-run

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