Fixes #5538

Fixes mucus attempting to randomize a list of viruses instead of the first virus in the list

code/controllers/Processes/alarm.dm

@@ -11,7 +11,7 @@
 var/datum/controller/process/alarm/alarm_manager
 
 /datum/controller/process/alarm
-	var/list/datum/alarm/all_handlers
+	var/list/datum/alarm/all_handlers = list()
 
 /datum/controller/process/alarm/setup()
 	name = "alarm"

code/game/objects/effects/decals/Cleanable/humans.dm

@@ -250,4 +250,4 @@ var/global/list/image/splatter_cache=list()
 /obj/effect/decal/cleanable/mucus/mapped/New()
 	..()
 	virus2 |= new /datum/disease2/disease
-	virus2.makerandom()
+	virus2[1].makerandom()