Receiving a non-200 status code causes a TypeError

[RA80533]

TypeError: the JSON object must be str, bytes or bytearray, not NoneType

unwebpack-sourcemap/unwebpack_sourcemap.py

Lines 214 to 218 in cab69dc

	if result.status_code == 200:
	return result.text
	else:
	print("WARNING: Got status code %d for URI %s" % (result.status_code, uri))
	return False

unwebpack-sourcemap/unwebpack_sourcemap.py

Lines 93 to 97 in cab69dc

	data = self._get_remote_data(uri)
	if data is not None:
	self._parse_sourcemap(data, True)
	else:
	print("WARNING: Could not retrieve sourcemap from URI %s" % uri)

Line 218 should be changed to return None rather than False.