fix a light issue (#9886)

code/game/turfs/turf_changing.dm

@@ -182,7 +182,7 @@
 
 	propogate_sunlight_changes(oldtype, old_density, new_turf)
 	var/turf/simulated/cur_turf = src
-	if(is_open != was_open)
+	if(istype(cur_turf) && is_open != was_open)
 		do
 			cur_turf = GetBelow(cur_turf)
 			if(is_open)

code/modules/lighting/sunlight_handler_ch.dm

@@ -25,6 +25,11 @@
 			shandler = new(src)
 			shandler.manualInit()
 
+/turf/simulated/lighting_build_overlay()
+	..()
+	if(shandler)
+		shandler.only_sun_object = lighting_object
+
 /datum/sunlight_handler
 	var/datum/simple_sun/sun
 	var/turf/simulated/holder