Merge branch '469446-fix-export' into 'master'

Add safeguard for author in export setter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157814



Merged-by: Brian Williams <bwilliams@gitlab.com>
Approved-by: Brian Williams <bwilliams@gitlab.com>
Co-authored-by: Subashis <schakraborty@gitlab.com>