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ERROR: test_all_cycle (conftool.tests.integration.test_dbconfig.ConftoolTestCase)
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Traceback (most recent call last):
  File "/home/cdanis/work/gits/conftool/conftool/tests/integration/test_dbconfig.py", line 79, in test_all_cycle
    self.assertEqual(cli.run_action(), 0)
  File "/home/cdanis/work/gits/conftool/conftool/extensions/dbconfig/cli.py", line 30, in run_action
    result = getattr(self, '_run_on_{}'.format(self.args.object_name))()
  File "/home/cdanis/work/gits/conftool/conftool/extensions/dbconfig/cli.py", line 124, in _run_on_config
    return self.db_config.commit(batch=self.args.batch, datacenter=dc)
  File "/home/cdanis/work/gits/conftool/conftool/extensions/dbconfig/config.py", line 316, in commit
    has_diff, diff = self.diff_configs(previous_config, config, datacenter=datacenter)
  File "/home/cdanis/work/gits/conftool/conftool/extensions/dbconfig/config.py", line 282, in diff_configs
    _to_json_lines(_get(a, [dc, stanza])),
  File "/home/cdanis/work/gits/conftool/conftool/extensions/dbconfig/config.py", line 255, in _get
    if b not in subtree:
TypeError: argument of type 'NoneType' is not iterable


A: {'dcA': None, 'dcB': None}

B: {'dcA': {'sectionLoads': defaultdict(<function DbConfig.compute_config.<locals>.<lambda> at 0x7f64f4403d90>, {'s1': [{'dba1': 5}, {'dba2': 10}], 's2': [{'dba2': 10}, {}]}), 'groupLoadsBySection': {'s1': defaultdict(<class 'collections.OrderedDict'>, {'recentChanges': OrderedDict([('dba2', 1)])})}, 'readOnlyBySection': {}}} --get-> {'sectionLoads': defaultdict(<function DbConfig.compute_config.<locals>.<lambda> at 0x7f64f4403d90>, {'s1': [{'dba1': 5}, {'dba2': 10}], 's2': [{'dba2': 10}, {}]}), 'groupLoadsBySection': {'s1': defaultdict(<class 'collections.OrderedDict'>, {'recentChanges': OrderedDict([('dba2', 1)])})}, 'readOnlyBySection': {}}