Editing a HostGroup fails with "undefined method `each' for nil:NilClass" error
Issue
An attempt to edit a HostGroup fails with error Oops, we're sorry but something went wrong undefined methodname' for nil:NilClass. Subsequentforeman-rake errors:fetch_log request_id=..` command shows the exception from Diagnostic Steps.
Environment
Red Hat Satellite 6.10 (older versions probably also affected)
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