Add a new enrollment flow does not render correctly

The view /co_enrollment_flow/add/co:2 renders the form but with no CSS.

The logged error is

gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | 2020-01-29 15:30:22 Notice: Notice (8): Undefined variable: co_enrollment_flows in [/srv/comanage-registry/app/View/CoEnrollmentFlows/fields.inc, line 949]
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Trace:
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | ErrorHandler::handleError() - CORE/Cake/Error/ErrorHandler.php, line 230
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | include - APP/View/CoEnrollmentFlows/fields.inc, line 949
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | include - APP/View/Standard/add.ctp, line 69
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | View::_evaluate() - CORE/Cake/View/View.php, line 971
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | View::_render() - CORE/Cake/View/View.php, line 933
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | View::render() - CORE/Cake/View/View.php, line 473
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Controller::render() - CORE/Cake/Controller/Controller.php, line 963
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | [main] - APP/webroot/index.php, line 96
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | 2020-01-29 15:30:22 Error: [TypeError] Argument 1 passed to Hash::extract() must be of the type array, null given, called in /srv/comanage-registry/app/View/CoEnrollmentFlows/fields.inc on line 950
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Request URL: /registry/co_enrollment_flows/add/co:2
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | Stack Trace:
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #0 /srv/comanage-registry/app/View/CoEnrollmentFlows/fields.inc(950): Hash::extract(NULL, '

[authenticat...')
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #1 /srv/comanage-registry/app/View/Standard/add.ctp(69): include('/srv/comanage-r...')
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #2 /srv/comanage-registry/lib/Cake/View/View.php(971): include('/srv/comanage-r...')
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #3 /srv/comanage-registry/lib/Cake/View/View.php(933): View->_evaluate('/srv/comanage-r...', Array)
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #4 /srv/comanage-registry/lib/Cake/View/View.php(473): View->_render('/srv/comanage-r...')
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #5 /srv/comanage-registry/lib/Cake/Controller/Controller.php(963): View->render(NULL, NULL)
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #6 /srv/comanage-registry/lib/Cake/Routing/Dispatcher.php(200): Controller->render()
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #7 /srv/comanage-registry/lib/Cake/Routing/Dispatcher.php(167): Dispatcher->_invoke(Object(CoEnrollmentFlowsController), Object(CakeRequest))
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #8 /srv/comanage-registry/app/webroot/index.php(96): Dispatcher->dispatch(Object(CakeRequest), Object(CakeResponse))
gw-astronomy_comanage-registry.1.ttzi2vrmw9ju@docker01-b-test.cilogon.org | #9