Fix display of inactive/unregistered user profiles

If you go to a user profile that doesn't exist or of a user that has been deleted/inactive it produces bad behavior

assigned to @tae-hoon

If the FE believes the URL is to a profile and it doesn't receive any data from the BE, perhaps we should have it print something like "Sorry, this profile does not exist"

mentioned in merge request !606 (merged)

i'd love to see SOMETHING from BE so that we actually know that there's an error

Is the current proposal basically "Didn't get data back, assume the profile doesn't exist"? In that case it prevents us from detecting an actual error.

closed via commit dc01f90d

closed via merge request !606 (merged)

mentioned in commit dc01f90d