File "/usr/lib/python2.7/dist-packages/schooltool/ldap/config.py", line 296, in handle_configuration
    fallback_login_filter=config.default_login_filter)
  File "/usr/lib/python2.7/dist-packages/schooltool/ldap/config.py", line 163, in parse
    self.after_parse(config_file, cache)
  File "/usr/lib/python2.7/dist-packages/schooltool/ldap/config.py", line 169, in after_parse
    self.set_fallback_query(cache)
  File "/usr/lib/python2.7/dist-packages/schooltool/ldap/config.py", line 200, in set_fallback_query
    cleanup_ldap_filter(cache['fallback_filter'])
KeyError: 'fallback_filter'