[MIRROR] Fixes a bunch of harddels that are sourced from player action (#6252)

* Fixes a bunch of harddels that are sourced from player action

* Mirror!

Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>
Co-authored-by: Funce <funce.973@gmail.com>

code/modules/shuttle/emergency.dm

@@ -746,6 +746,11 @@
 	SSshuttle.emergency = current_emergency
 	SSshuttle.backup_shuttle = src
 
+/obj/docking_port/mobile/emergency/backup/Destroy(force)
+	if(SSshuttle.backup_shuttle == src)
+		SSshuttle.backup_shuttle = null
+	return ..()
+
 /obj/docking_port/mobile/emergency/shuttle_build/register()
 	. = ..()
 	initiate_docking(SSshuttle.getDock("emergency_home"))

code/modules/shuttle/shuttle.dm

@@ -892,8 +892,16 @@
 	var/range = (engine_coeff * max(width, height))
 	var/long_range = range * 2.5
 	var/atom/distant_source
-	if(engine_list[1])
-		distant_source = engine_list[1]
+	var/list/engines = list()
+	for(var/datum/weakref/engine in engine_list)
+		var/obj/structure/shuttle/engine/real_engine = engine.resolve()
+		if(!real_engine)
+			engine_list -= engine
+			continue
+		engines += real_engine
+
+	if(engines[1])
+		distant_source = engines[1]
 	else
 		for(var/A in areas)
 			distant_source = locate(/obj/machinery/door) in A
@@ -907,11 +915,11 @@
 				M.playsound_local(distant_source, "sound/runtime/hyperspace/[selected_sound]_distance.ogg", 100)
 			else if(dist_far <= range)
 				var/source
-				if(engine_list.len == 0)
+				if(engines.len == 0)
 					source = distant_source
 				else
 					var/closest_dist = 10000
-					for(var/obj/O in engine_list)
+					for(var/obj/O in engines)
 						var/dist_near = get_dist(M, O)
 						if(dist_near < closest_dist)
 							source = O
@@ -936,7 +944,7 @@
 		var/area/shuttle/areaInstance = thing
 		for(var/obj/structure/shuttle/engine/E in areaInstance.contents)
 			if(!QDELETED(E))
-				engine_list += E
+				engine_list += WEAKREF(E)
 				. += E.engine_power
 
 // Double initial engines to get to 0.5 minimum