fix bug with null history

Author Chris Pollett <chris@pollett.org>
Author date 2023-02-01 07:Feb:st
Author local date 2023-01-31 23:Jan:st -0800
Committer Chris Pollett <chris@pollett.org>
Committer date 2023-02-01 07:Feb:st
Committer local date 2023-01-31 23:Jan:st -0800
Commit 90a4f1fd2d2ba6290906333816dae827a3f7dfdf
Tree e0fa613389bb2da62e4c1cd4f0382423d523e416
Parent a1752ab80d532fb045ef888d43d03199c32de4f8
fix bug with null history
Affected files:
js/game.js
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