Merge pull request #10689 from Ghommie/Ghommie-cit524

Even more runtime fixes.

code/game/objects/structures/door_assembly.dm

@@ -205,6 +205,9 @@
 					if(!mineral)
 						if(istype(G, /obj/item/stack/sheet/mineral) && G.sheettype)
 							var/M = G.sheettype
+							var/mineralassembly = text2path("/obj/structure/door_assembly/door_assembly_[M]")
+							if(!mineralassembly)
+								return
 							if(G.get_amount() >= 2)
 								playsound(src, 'sound/items/crowbar.ogg', 100, 1)
 								user.visible_message("[user] adds [G.name] to the airlock assembly.", \
@@ -214,7 +217,6 @@
 										return
 									to_chat(user, "<span class='notice'>You install [M] plating into the airlock assembly.</span>")
 									G.use(2)
-									var/mineralassembly = text2path("/obj/structure/door_assembly/door_assembly_[M]")
 									var/obj/structure/door_assembly/MA = new mineralassembly(loc)
 									transfer_assembly_vars(src, MA, TRUE)
 							else

code/game/objects/structures/girders.dm

@@ -166,6 +166,9 @@
 		if(S.sheettype && S.sheettype != "runed")
 			var/M = S.sheettype
 			if(state == GIRDER_DISPLACED)
+				var/F = text2path("/obj/structure/falsewall/[M]")
+				if(!F)
+					return
 				if(S.get_amount() < 2)
 					to_chat(user, "<span class='warning'>You need at least two sheets to create a false wall!</span>")
 					return
@@ -174,11 +177,13 @@
 						return
 					S.use(2)
 					to_chat(user, "<span class='notice'>You create a false wall. Push on it to open or close the passage.</span>")
-					var/F = text2path("/obj/structure/falsewall/[M]")
 					var/obj/structure/FW = new F (loc)
 					transfer_fingerprints_to(FW)
 					qdel(src)
 			else
+				var/F = text2path("/turf/closed/wall/mineral/[M]")
+				if(!F)
+					return
 				if(S.get_amount() < 2)
 					to_chat(user, "<span class='warning'>You need at least two sheets to add plating!</span>")
 					return
@@ -189,7 +194,7 @@
 					S.use(2)
 					to_chat(user, "<span class='notice'>You add the plating.</span>")
 					var/turf/T = get_turf(src)
-					T.PlaceOnTop(text2path("/turf/closed/wall/mineral/[M]"))
+					T.PlaceOnTop(F)
 					transfer_fingerprints_to(T)
 					qdel(src)
 				return