Fix runtimes when events cannot find a valid event area (#26594)

* Fix runtimes when events cannot find a valid event area

* oops

code/game/objects/effects/spawners/mess_spawners.dm

@@ -194,6 +194,9 @@
 	var/mess_count = rand(5, 10)
 	for(var/i in 1 to mess_count)
 		var/area/target_area = findEventArea()
+		if(!target_area)
+			log_debug("Failed to generate themed messes: No valid event areas were found.")
+			return
 		var/list/turfs = get_area_turfs(target_area)
 		while(length(turfs))
 			var/turf/T = pick_n_take(turfs)

code/modules/events/event_procs.dm

@@ -39,6 +39,8 @@
 	var/list/remove_these_areas = safe_areas - allowed_areas
 	var/list/possible_areas = typecache_filter_list_reverse(SSmapping.existing_station_areas, remove_these_areas)
 
+	if(!length(possible_areas))
+		return null
 	return pick(possible_areas)
 
 /proc/findUnrestrictedEventArea() //Does almost the same as findEventArea() but hits a few more areas including maintenance and the AI sat, and also returns a list of all the areas, instead of just one area

code/modules/events/tear.dm

@@ -18,6 +18,8 @@
 	impact_area = findEventArea()
 
 /datum/event/tear/start()
+	if(isnull(impact_area))
+		log_debug("No valid event areas could be generated for dimensional tear.")
 	var/list/area_turfs = get_area_turfs(impact_area)
 	while(length(area_turfs))
 		var/turf/T = pick_n_take(area_turfs)
@@ -45,6 +47,9 @@
 	if(!target_area)
 		if(false_alarm)
 			target_area = findEventArea()
+			if(isnull(target_area))
+				log_debug("Tried to announce a false-alarm tear without a valid area!")
+				kill()
 		else
 			log_debug("Tried to announce a tear without a valid area!")
 			kill()