Acceptance tests using different clients concurrently. Environment deployed from packages.

Build: #1068 failed

Job: Groups basic failed

user removes group from parent group[1oz 1op 1oc-RESt-web GUi]: Test case result

The below summarizes the result of the test " user removes group from parent group[1oz 1op 1oc-RESt-web GUi]" in build 1,068 of Onedata Products - mixed acceptance pkg - Chrome groups basic tests.
Description
user removes group from parent group[1oz 1op 1oc-RESt-web GUi]
Test class
mixed.scenarios.test_groups_basic
Method
test_user_removes_group_from_parent_group[1oz_1op_1oc-REST-web GUI]
Duration
16 secs
Status
Failed (New Failure)

Error Log

ValueError: Invalid value for `creation_time`, must not be `None`
request = <FixtureRequest for <Function 'test_user_removes_group_from_parent_group[1oz_1op_1oc-REST-web GUI]'>>

    @pytest.mark.usefixtures(*function_args)
    def scenario_wrapper(request):
>       _execute_scenario(feature, scenario, request, encoding)

/usr/local/lib/python3.6/dist-packages/pytest_bdd/scenario.py:227: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/local/lib/python3.6/dist-packages/pytest_bdd/scenario.py:189: in _execute_scenario
    _execute_step_function(request, scenario, step, step_func)
/usr/local/lib/python3.6/dist-packages/pytest_bdd/scenario.py:130: in _execute_step_function
    step_func(**kwargs)
tests/mixed/steps/group_basic.py:40: in assert_groups
    see_groups_using_rest(user, users, hosts, group_list, host)
tests/mixed/steps/rest/onezone/group_management.py:37: in see_groups_using_rest
    assert get_group(group_name, user_client), 'There is no ' \
tests/mixed/steps/rest/onezone/common.py:53: in get_group
    g = group_api.get_group(group)
tests/mixed/onezone_client/apis/group_api.py:2163: in get_group
    (data) = self.get_group_with_http_info(id, **kwargs)
tests/mixed/onezone_client/apis/group_api.py:2236: in get_group_with_http_info
    collection_formats=collection_formats)
tests/mixed/onezone_client/api_client.py:317: in call_api
    _return_http_data_only, collection_formats, _preload_content, _request_timeout)
tests/mixed/onezone_client/api_client.py:159: in __call_api
    return_data = self.deserialize(response_data, response_type)
tests/mixed/onezone_client/api_client.py:232: in deserialize
    return self.__deserialize(data, response_type)
tests/mixed/onezone_client/api_client.py:272: in __deserialize
    return self.__deserialize_model(data, klass)
tests/mixed/onezone_client/api_client.py:616: in __deserialize_model
    instance = klass(**kwargs)
tests/mixed/onezone_client/models/group.py:66: in __init__
    self.creation_time = creation_time
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = {'creation_time': None,
 'creator': None,
 'group_id': '2e310190a4f0526cce6d5c0b2b76edc9ch7e5d',
 'name': 'child',
 'type': 'team'}
creation_time = None

    @creation_time.setter
    def creation_time(self, creation_time):
        """
            Sets the creation_time of this Group.
    
            :param creation_time: The creation_time of this Group.
            :type: Timestamp
            """
        if creation_time is None:
>           raise ValueError("Invalid value for `creation_time`, must not be `None`")
E           ValueError: Invalid value for `creation_time`, must not be `None`

tests/mixed/onezone_client/models/group.py:189: ValueError