2026-June-24 - 2026-06.16.15655

Ensure no error message is thrown when no first enemy found (#14622)

When pressing ctrl+B in a territory with only friendly units, the game will assign the first enemy player in turn order it finds as the attacker. If no such player is found, the game throws an error message. Instead, it is better to return null, as null is also a viable return statement. This makes the game continue and not crash.