Error Log

AttributeError: 'NoneType' object has no attribute 'elements_list'
request = <FixtureRequest for <Function 'test_user_successfully_creates_new_harvester[1oz_1op_elasticsearch]'>>

    @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/utils/bdd_utils.py:77: in wrapper
    return fun(*ba.args, **ba.kwargs)
<decorator-gen-655>:2: in check_harvester_exists_on_harvesters_list
    ???
tests/utils/utils.py:90: in wrapper
    return fun(*args, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

selenium = {'browser': <selenium.webdriver.chrome.webdriver.WebDriver (session="c6d783274d4ff518955dd16663e485fc")>}
browser_id = 'browser', oz_page = <class 'tests.gui.utils.onezone.OZLoggedIn'>
harvester_name = 'harvester1', option = 'appeared on'

    @wt(parsers.parse('user of {browser_id} sees that "{harvester_name}" '
                      'has {option} the harvesters list in the sidebar'))
    @repeat_failed(timeout=WAIT_FRONTEND)
    def check_harvester_exists_on_harvesters_list(selenium, browser_id, oz_page,
                                                  harvester_name, option):
        driver = selenium[browser_id]
    
        if option.startswith('appeared'):
>           assert harvester_name in oz_page(driver)['discovery'].elements_list, \
                'harvester "{}" not found'.format(harvester_name)
E           AttributeError: 'NoneType' object has no attribute 'elements_list'

tests/gui/steps/onezone/harvesters/discovery.py:44: AttributeError