1. On mobile, opened Friend list screen, searched for a user from the reserved usernames list (we have some of them on staging)
2. Tapped "Add" button
- Before this diff: //"Unknown error"// alert caused by `[Error: Cannot fetch user identity]`
- After this diff: User is added to friend list as non-supporting thick threads (given it exists on my local keyserver, otherwise `invalid_user` is thrown)
Also, console.logged values of `isReserved`, `doesNotExist` and `usersSupportingThickThreads.get(userID)` to confirm they're correct.