Shitload of bugfixes.

code/game/objects/devices/PDA/cart.dm

@@ -612,9 +612,9 @@ Code:
 						blood[main_blood] = A.blood_DNA[blood]
 			return 1
 		var/list/sum_list[4]	//Pack it back up!
-		sum_list[1] = A.fingerprints.Copy()
-		sum_list[2] = A.suit_fibers.Copy()
-		sum_list[3] = A.blood_DNA.Copy()
+		sum_list[1] = A.fingerprints ? A.fingerprints.Copy() : null
+		sum_list[2] = A.suit_fibers ? A.suit_fibers.Copy() : null
+		sum_list[3] = A.blood_DNA ? A.blood_DNA.Copy() : null
 		sum_list[4] = "\The [A] in \the [get_area(A)]"
 		stored_data["\ref [A]"] = sum_list
 		return 0

code/game/objects/stacks/metal.dm

@@ -142,7 +142,7 @@ var/global/list/datum/stack_recipe/plasteel_recipes = list ( \
 	return
 
 /obj/item/stack/tile/plasteel/proc/build(turf/S as turf)
-	S.ReplaceWithPlating()
+	S.ReplaceWithAirlessPlating()
 //	var/turf/simulated/floor/W = S.ReplaceWithFloor()
 //	W.make_plating()
 	return