Upcoming changes to the authentication model may mean that user
objects do not have an email address attached.
Change-Id: I4fddb810f723c790d243f779714ca7f189a02aeb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5770
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>