Reading config fails if no microservcies are configured

[surfnet-niels]

SATOSA/src/satosa/satosa_config.py

Line 47 in 34c5836

# Read plugin configs from dict or file path

If no microservcies are configured in proxy.yaml, SaToSa will not start nor construct SAML metadata as the above module fails to load plugin configuration:

File \"/home/debian/vopaas/virtualenv/lib/python3.5/site-packages/satosa/scripts/satosa_saml_metadata.py\", line 43, in create_and_write_saml_metadata, 
    satosa_config = SATOSAConfig(proxy_conf), 
File \"/home/debian/vopaas/virtualenv/lib/python3.5/site-packages/satosa/satosa_config.py\", line 50, in __init__, 
    for config in self._config.get(key, []):, 
TypeError: 'NoneType' object is not iterable"], "stdout": "", "stdout_lines": []

[vladimir-mencl-eresearch]

FYI, a way around this is to use the YAML syntax for empty list instead of letting the YAML parser put in the None value:

MICRO_SERVICES: []