Ignore unknown nodes when loading in saves

worldedit/serialization.lua

@@ -241,6 +241,7 @@ end
 
 --- Loads the nodes represented by string `value` at position `origin_pos`.
 -- @return The number of nodes deserialized.
+local registered_nodes = minetest.registered_nodes
 function worldedit.deserialize(origin_pos, value)
 	local nodes = load_schematic(value)
 	if not nodes then return nil end
@@ -252,11 +253,13 @@ function worldedit.deserialize(origin_pos, value)
 	local origin_x, origin_y, origin_z = origin_pos.x, origin_pos.y, origin_pos.z
 	local add_node, get_meta = minetest.add_node, minetest.get_meta
 	for i, entry in ipairs(nodes) do
-		entry.x, entry.y, entry.z = origin_x + entry.x, origin_y + entry.y, origin_z + entry.z
-		-- Entry acts as both position and node
-		add_node(entry, entry)
-		if entry.meta then
-			get_meta(entry):from_table(entry.meta)
+		if registered_nodes[entry.name] then
+			entry.x, entry.y, entry.z = origin_x + entry.x, origin_y + entry.y, origin_z + entry.z
+			-- Entry acts as both position and node
+			add_node(entry, entry)
+			if entry.meta then
+				get_meta(entry):from_table(entry.meta)
+			end
 		end
 	end
 	return #nodes