bugfix: Avoid null reference to last_user_message in ChatHistory #580
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@douglas-reid I'm not 100% sure if I'm fixing an error or enabling odd uses of ChatHistory, but some experiments I was doing in the game resulted in attempting to do a completion on a history where the user hadn't yet chimed in, and that caused None-deferences in the code touched in this PR.
Does this look OK to you? I gave it an eyeball scan, but I know this code is very delicate..