tracker2: handle nonexistent users better (#22978)
tracker2: handle nonexistent users better (#22978)

* tracker2: handle nonexistent users better

* use a different strategy

* :shower:
keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client