Scavenging element.

code/modules/antagonists/traitor/datum_traitor.dm

@@ -48,7 +48,7 @@
 			var/datum/traitor_class/class = GLOB.traitor_classes[C]
 			var/weight = LOGISTIC_FUNCTION(1.5*class.weight,chaos_weight,class.chaos,0)
 			weights[C] = weight * 1000
-	var/choice = pickweightAllowZero(weights)
+	var/choice = pickweight(weights, 0)
 	if(!choice)
 		choice = TRAITOR_HUMAN // it's an "easter egg"
 	var/datum/traitor_class/actual_class = GLOB.traitor_classes[choice]

code/modules/mob/living/simple_animal/friendly/mouse.dm

@@ -97,6 +97,8 @@
 	body_color = "brown"
 	icon_state = "mouse_brown"
 
+GLOBAL_VAR(tom_existed)
+
 //TOM IS ALIVE! SQUEEEEEEEE~K :)
 /mob/living/simple_animal/mouse/brown/Tom
 	name = "Tom"
@@ -106,6 +108,10 @@
 	response_harm   = "splats"
 	gold_core_spawnable = NO_SPAWN
 
+/mob/living/simple_animal/mouse/brown/Tom/Initialize()
+	. = ..()
+	GLOB.tom_existed = TRUE
+
 /obj/item/reagent_containers/food/snacks/deadmouse
 	name = "dead mouse"
 	desc = "It looks like somebody dropped the bass on it. A lizard's favorite meal."