Crash when changing bb_duelbots_num_bots or bb_duelbots_proportional

[gbhjester]

Changing bb_duelbots_num_bots or bb_duelbots_proportional on a duel map results in a crash. Only tested when hosting local server / playing offline.

Reproduce : join duel map, change bb_duelbots_num_bots or bb_duelbots_proportional. Game will crash to desktop.