Merge branch 'jc/undefined-in-rte-fix' into 'master'

Handle undefined body and html for rte

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184140



Merged-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Nick Leonard <nleonard@gitlab.com>
Reviewed-by: Nick Leonard <nleonard@gitlab.com>
Co-authored-by: Jack Chapman <jachapman@gitlab.com>