When editing an existing host and removing the primary, managed and provision flags from the single interface and then saving the host yield the following error:

NoMethodError (undefined method `changed?' for nil:NilClass):
17:30:04 rails.1 | | app/models/host/managed.rb:970:in `trigger_nic_orchestration'
17:30:04 rails.1 | | app/models/concerns/orchestration.rb:86:in `valid?'
17:30:04 rails.1 | | app/models/concerns/foreman/sti.rb:29:in `save_with_type'
17:30:04 rails.1 | | app/controllers/hosts_controller.rb:122:in `block in update'
17:30:04 rails.1 | | app/models/taxonomy.rb:65:in `block in no_taxonomy_scope'
17:30:04 rails.1 | | app/models/taxonomy.rb:72:in `block (2 levels) in as_taxonomy'
17:30:04 rails.1 | | app/models/concerns/foreman/thread_session.rb:150:in `as_location'
17:30:04 rails.1 | | app/models/taxonomy.rb:71:in `block in as_taxonomy'
17:30:04 rails.1 | | app/models/concerns/foreman/thread_session.rb:115:in `as_org'
17:30:04 rails.1 | | app/models/taxonomy.rb:70:in `as_taxonomy'
17:30:04 rails.1 | | app/models/taxonomy.rb:64:in `no_taxonomy_scope'
17:30:04 rails.1 | | app/controllers/hosts_controller.rb:119:in `update'
17:30:04 rails.1 | | app/controllers/concerns/application_shared.rb:15:in `set_timezone'
17:30:04 rails.1 | | app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
17:30:04 rails.1 | | app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
17:30:04 rails.1 | | lib/middleware/catch_json_parse_errors.rb:8:in `call'
17:30:04 rails.1 | | lib/middleware/tagged_logging.rb:18:in `call'