Unable to start AI sandbox difficulty from the command line

[Langbart]

to reproduce

• try to start a match with an AI player set to difficulty 0 (sandbox)
  • see binaries/system/readme.txt​

Line
12	-autostart-ai=PLAYER:AI sets the AI for PLAYER (e.g. 2:petra)
13	-autostart-aidiff=PLAYER:DIFF sets the DIFFiculty of PLAYER's AI (0: sandbox, 5: very hard)
14	-autostart-aiseed=AISEED sets the seed used for the AI random generator (default 0, use -1 for random)

pyrogenesis -autostart="random/mainland" -autostart-ai=1:petra -autostart-aidiff=1:0 -autostart-player=-1

errrors

0 A.D. (0.0.27) Main log (warnings and errors only)
ERROR: JavaScript error: gamesettings/attributes/PlayerAI.js line 51 Engine.ConfigDB_GetValue is not a function fromInitAttributes@gamesettings/attributes/PlayerAI.js:51:46 fromInitAttributes@gamesettings/GameSettings.js:90:17 AutoStart@autostart/autostart.js:6:17 autostartHost@autostart/entrypoint.js:49:23

Engine exited successfully on 2023-04-01 at 14:38:55 with 423 message(s), 1 error(s) and 0 warning(s).

reproducible

• issue does not occur in A25b [25860]
• issue occurs in A26 [27104]

bisect (not tested, just a guess based on previous tickets)

• likely introduced with [26584]

related tickets

• #6471 (21/Mar/22)
• #6521 (26/Apr/22)

[Stan]

In 27637:

Allow starting by command with sandbox AI.

takes 0 as false; ?? doesn't.

Patch by: @Freagarach
Accepted by: @sera, @Langbart

Fixes: #6771

Differential Revision: ​https://code.wildfiregames.com/D4975