SetMap returns undefined if not set up
SetMap returns undefined if not set up

Without this, it's not possible to use ThumbCard, etc., without having
set up the SetMap.

https://phabricator.endlessm.com/T11465

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib