message: turn NPE on flair resolution errors into a logged error
diff: @@ -129,7 +129,11 @@ class FlairStore extends EventEmitter {
  }
  const updatedUserGroups = resp.users;
  usersInFlight.forEach((userId) => {
  + if (this._usersPending[userId]) {
  this._usersPending[userId].resolve(updatedUserGroups[userId] || []);
  + } else {
  + console.error("Promise vanished for resolving groups for " + userId);
  + }
  });
  }
  