skip recipes with unknown items

cache.lua

@@ -153,7 +153,11 @@ function cache.fill_recipe_cache()
 									end
 								end
 							else
-								table.insert(itemlist,recipe_item)
+								if minetest.registered_items[recipe_item] == nil then
+									minetest.log("verbose", "[smartfs_inventory] unknown item in recipe: "..itemname)
+								else
+									table.insert(itemlist,recipe_item)
+								end
 							end
 							cache.crecipes[recipe].recipe_items[recipe_item] = {}
 							for _, itemname in ipairs(itemlist) do
@@ -224,17 +228,22 @@ function cache.get_recipes_craftable_atnext(player, item)
 				end)
 			end
 			if def then
+				local recipe_ok = false
 				for recipe_item, itemtab in pairs(cache.crecipes[recipe].recipe_items) do
+					recipe_ok = false
 					for _, itemname in ipairs(itemtab) do
-						if filter.is_revealed_item(itemname, player) then
+						if filter.is_revealed_item(itemname, player) == true then
-							recipe_with_one_item_in_inventory[recipe] = true
+							recipe_ok = true
 							break
 						end
 					end
-					if recipe_with_one_item_in_inventory[recipe] == true then
+					if recipe_ok == false then
 						break
 					end
 				end
+				if recipe_ok then
+					recipe_with_one_item_in_inventory[recipe] = true
+				end
 			end
 		end
 	end

filter.lua

@@ -52,9 +52,12 @@ filter.register_filter({
 		end
 	})
 
----TODO: irgend wo einbauen!
 function filter.is_revealed_item(itemname, playername)
 	local cache = smart_inventory.cache
+	if minetest.registered_items[itemname] == nil then
+		return false
+	end
+
 	if smart_inventory.doc_items_mod then
 		local category_id
 		if not cache.citems[itemname] then
@@ -72,12 +75,15 @@ function filter.is_revealed_item(itemname, playername)
 			end
 			if category_id then
 				return doc.entry_revealed(playername, category_id, itemname)
+			else
+				-- unknown item
+				return false
 			end
-			return true --should not be happen. But take it visible if the item is not a node or tool or item
 		end
 	end
 	return true
 end
-	----------------
+
+----------------
 return filter