Remove transit when not in use

Now with pretty colors!

code/modules/shuttle/shuttle.dm

@@ -158,15 +158,26 @@
 	name = "In Transit"
 	turf_type = /turf/open/space/transit
 	var/list/turf/assigned_turfs = list()
+	var/obj/docking_port/mobile/owner
 
 /obj/docking_port/stationary/transit/New()
 	..()
 	SSshuttle.transit += src
 
+/obj/docking_port/stationary/transit/proc/dezone()
+	for(var/i in assigned_turfs)
+		var/turf/T = i
+		if(T.type == turf_type)
+			T.ChangeTurf(/turf/open/space)
+			T.flags |= UNUSED_TRANSIT_TURF
+
 /obj/docking_port/stationary/transit/Destroy(force=FALSE)
 	if(force)
 		SSshuttle.transit -= src
+		if(owner)
+			owner = null
 		if(assigned_turfs)
+			dezone()
 			assigned_turfs.Cut()
 		assigned_turfs = null
 	. = ..()