stop using the UID from the card.json response
stop using the UID from the card.json response

We already have the UID when we run this engine. Also, users who haven't
set any profile fields will have a null profile in the response, and
this was triggering a warning when we tried to parse out the UID.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client