GetUserInfo: Return an error if no user was found (#44169)
GetUserInfo: Return an error if no user was found (#44169)

* return an error if no user was found

* Update database.go

Co-authored-by: Kevin Minehart <ab51905254e649b0a330765d79844e0a795d14e7@gmail.com>
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana