Avoid a nil index crash

Kyle

2013-02-22 985401a23d1581e71f762bdaeadfc19734fdf148

 technic/items.lua

@@ -10,6 +10,8 @@
   on_place_on_ground = minetest.craftitem_place_item,
})

-- tubes crafting recipes

minetest.register_craft({
   output = 'pipeworks:tube_000000 9',
   recipe = {
@@ -25,6 +27,36 @@
      }
})

minetest.register_craft({
    output = 'pipeworks:accelerator_tube_000000',
    recipe = {
        {'technic:copper_coil', 'pipeworks:tube_000000', 'technic:copper_coil'},
        }
})

minetest.register_craft({
    output = 'pipeworks:detector_tube_off_000000',
    recipe = {
        {'mesecons:mesecon', 'pipeworks:tube_000000', 'mesecons:mesecon'},
        }
})

minetest.register_craft({
    output = 'pipeworks:sand_tube_000000',
    recipe = {
        {'default:sand', 'pipeworks:tube_000000', 'default:sand'},
        }
})

minetest.register_craft({
    output = 'pipeworks:teleport_tube_000000',
    recipe = {
        {'default:mese_crystal', 'technic:copper_coil', 'default:mese_crystal'},
        {'pipeworks:tube_000000', 'technic:control_logic_unit', 'pipeworks:tube_000000'},
        {'default:mese_crystal', 'technic:copper_coil', 'default:mese_crystal'},
        }
})

minetest.register_craftitem( "technic:diamond_drill_head", {
   description = "Diamond Drill Head",
   inventory_image = "technic_diamond_drill_head.png",