Correctly handle invalid definition files from internal events cli

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/170622



Merged-by: Gavin Hinfey <ghinfey@gitlab.com>
Approved-by: Nwanna Isong <nisong@gitlab.com>
Approved-by: Gavin Hinfey <ghinfey@gitlab.com>
Co-authored-by: syasonik <syasonik@gitlab.com>