Config download with blacklisted nodes (DeploymentServerBlacklist) fails with KeyError for NetworkConfig

Traceback from mistral logs:

2019-11-17 05:33:44.274 7 WARNING mistral.executors.default_executor [req-3b389857-c2ef-4223-b039-2cd72f275e2e 0253185b0727471ca2983c94ac019df1 355d8393d3ad4f51999dc6a24b753223 - default default] The action raised an exception [action_ex_id=27c39026-5a79-4acb-9400-bd1cc037e87e, msg=''networker-0'', action_cls='<class 'mistral.actions.action_factory.GetOvercloudConfig'>', attributes='{}', params='{'container': 'overcloud', 'container_config': 'overcloud-config'}']: KeyError: 'networker-0'
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor Traceback (most recent call last):
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor File "/usr/lib/python3.6/site-packages/mistral/executors/default_executor.py", line 114, in run_action
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor result = action.run(action_ctx)
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor File "/usr/lib/python3.6/site-packages/tripleo_common/actions/config.py", line 87, in run
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor commit_message=message)
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor File "/usr/lib/python3.6/site-packages/tripleo_common/utils/config.py", line 547, in download_config
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor self.write_config(stack, name, config_dir, config_type)
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor File "/usr/lib/python3.6/site-packages/tripleo_common/utils/config.py", line 524, in write_config
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor self.render_network_config(stack, config_dir, server_roles)
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor File "/usr/lib/python3.6/site-packages/tripleo_common/utils/config.py", line 207, in render_network_config
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor config_dir, server_roles[server], server)
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor KeyError: 'networker-0'
2019-11-17 05:33:44.274 7 ERROR mistral.executors.default_executor