Porting updates related to material datums. (#12317)

* Porting updates related to material datums.

* art_type

* oh oh

code/modules/photography/photos/frame.dm

@@ -4,7 +4,7 @@
 	name = "picture frame"
 	desc = "The perfect showcase for your favorite deathtrap memories."
 	icon = 'icons/obj/decals.dmi'
-	custom_materials = null
+	custom_materials = list(/datum/material/wood = 2000)
 	flags_1 = 0
 	icon_state = "frame-empty"
 	result_path = /obj/structure/sign/picture_frame
@@ -64,6 +64,7 @@
 	desc = "Every time you look it makes you laugh."
 	icon = 'icons/obj/decals.dmi'
 	icon_state = "frame-empty"
+	custom_materials = list(/datum/material/wood = 2000)
 	var/obj/item/photo/framed
 	var/persistence_id
 	var/can_decon = TRUE