Comment 1 for bug 1914084

(undercloud) [stack@undercloud-0 ~]$ tripleo-ansible-inventory --debug --static-yaml-inventory /home/stack/inv.yaml
Error creating static inventory: 'Undercloud'
Traceback (most recent call last):
  File "/usr/bin/tripleo-ansible-inventory", line 218, in main
    inventory.write_static_inventory(configs.static_yaml_inventory)
  File "/usr/lib/python3.6/site-packages/tripleo_common/inventories.py", line 125, in write_static_inventory
    inventory = self._merge(dynamic=False)
  File "/usr/lib/python3.6/site-packages/tripleo_common/inventories.py", line 111, in _merge
    inventory['Undercloud']['vars']['plans'].sort()
KeyError: 'Undercloud'