Added back checks for difficulty on a per map basis

[Mailaender]

as this causes unnecessary lookups and error messages in debug.log for maps without difficulty configured.

[pchote]

This was exactly the concern I raised in #19738 so the motivation seems reasonable to me.

[abcdefg30]

This was exactly the concern I raised in #19738 so the motivation seems reasonable to me.

Changing this back and forth really seems counter intuitive to me. (We would have to revert the changes here sooner or later again.) Neither the lookups nor the debug messages seem like enough justification to change this back for me.

[pchote]

Makes sense. What do you think about adding a new API like Map.LobbyOptionOrDefault("difficulty", "normal")?

[abcdefg30]

That sounds like a good compromise.

[Mailaender]

Yes, that is a way better idea.

[PunkPun]

Changelog