Fixes vine/infestation events not working with new lighting

Also adds a helper for finding whether there are any simulated atoms on a turf

code/modules/events/infestation.dm

@@ -58,14 +58,10 @@
 			spawn_area_type = /area/security/tactical
 			locstring = "tactical equipment storage"
 
-	//world << "looking for [spawn_area_type]"
 	for(var/areapath in typesof(spawn_area_type))
-		//world << "	checking [areapath]"
 		var/area/A = locate(areapath)
-		//world << "	A: [A], contents.len: [A.contents.len]"
-			//world << "	B: [B], contents.len: [B.contents.len]"
 		for(var/turf/simulated/floor/F in A.contents)
-			if(!F.contents.len)
+			if(turf_clear(F))
 				turfs += F
 
 	var/list/spawn_types = list()

code/modules/hydroponics/spreading/spreading.dm

@@ -7,7 +7,7 @@
 		for(var/areapath in typesof(/area/hallway))
 			var/area/A = locate(areapath)
 			for(var/turf/simulated/floor/F in A.contents)
-				if(!F.contents.len)
+				if(turf_clear(F))
 					turfs += F
 
 		if(turfs.len) //Pick a turf to spawn at if we can