Fix issue handling null user when augmenting slim profile

While poking at staging, I found an issue with null handling. If it can't find the user, it attempts to fill an Optional with null, which crashes the app and sends 500.

added Bug MBO statewip team:webdev labels

assigned to @zacharysabourin

mentioned in commit zacharysabourin/eclipsefdn-profile-api@a30bcbba

mentioned in merge request !24 (merged)

mentioned in commit eb00ba76

closed with merge request !24 (merged)