Refactors false alarms (#22010)

* rework anomalies

* oh yeah, events, too.

* does remaining events

* fixes most issues

* oops

* this too

* ensures traders actually fake announce properly

* fix tear

* missing return

* And another missing return

code/modules/events/brand_intelligence.dm

@@ -13,8 +13,18 @@
 									"Advertising is legalized lying! But don't let that put you off our great deals!", \
 									"You don't want to buy anything? Yeah, well I didn't want to buy your mom either.")
 
-/datum/event/brand_intelligence/announce()
-	GLOB.minor_announcement.Announce("Rampant brand intelligence has been detected aboard [station_name()], please stand-by. The origin is believed to be \a [originMachine.category] vendor.", "Machine Learning Alert", 'sound/AI/brand_intelligence.ogg')
+/datum/event/brand_intelligence/announce(false_alarm)
+	var/alarm_source = originMachine
+	if(originMachine)
+		alarm_source = originMachine.category
+	else if(false_alarm)
+		alarm_source = pick(VENDOR_TYPE_GENERIC, VENDOR_TYPE_CLOTHING, VENDOR_TYPE_FOOD, VENDOR_TYPE_DRINK, VENDOR_TYPE_SUPPLIES, VENDOR_TYPE_DEPARTMENTAL, VENDOR_TYPE_RECREATION)
+	else
+		log_debug("Couldn't announce brand intelligence -- no machine was selected, and it wasn't a false alarm! Killing event.")
+		kill()
+		return
+
+	GLOB.minor_announcement.Announce("Rampant brand intelligence has been detected aboard [station_name()], please stand-by. The origin is believed to be \a [alarm_source] vendor.", "Machine Learning Alert", 'sound/AI/brand_intelligence.ogg')
 
 /datum/event/brand_intelligence/start()
 	var/list/obj/machinery/economy/vending/leaderables = list()