Download URL is needed if source URL is given in setup.py

[anders-kiaer]

If a plugin project has stated source url in setup.py, but not download url, it fails here:

webviz-config/webviz_config/_dockerize/_create_docker_setup.py

Lines 63 to 81 in e42cc2d

	if dist["download_url"] is None and dist["source_url"] is None:
	warnings.warn(
	f"Plugin distribution {dist_name} has no download/source URL specified. "
	"Will therefore not automatically become part of built Docker image."
	)
	continue
	if dist["download_url"].startswith(PYPI_URL_ROOT):
	pypi_data = requests.get(f"{PYPI_URL_ROOT}/pypi/{dist_name}/json").json()
	if dist["dist_version"] in pypi_data["releases"]:
	requirements.append(f"{dist_name}=={dist['dist_version']}")
	continue
	if dist["source_url"] is None:
	raise RuntimeError(
	f"Could not find version {dist['dist_version']} of {dist_name} on PyPI. "
	"Falling back to git source code is not possible since "
	"project_urls['Source'] is not defined in setup.py."
	)

AttributeError: 'NoneType' object has no attribute 'startswith'