Minetest: Digging an airlike node creates “unknown node” particles

[Wuzzy2]

When you dig an airlike node, you will see “unknown node” particles (unknown_node.png). This should never happen.

Why do I want to dig airlike nodes? Easy: Let's suppose I want to make an invisible but walkable, pointable and diggable block (e.g. invisible barrier), then I need this.

Example:

minetest.register_node("example:barrier", {
    description = "Barrier",
    drawtype = "airlike",
    paramtype = "light",
    inventory_image = "example_barrier_logo.png",
    wield_image = "example_barrier_logo.png",
    stack_max = 64,
    sunlight_propagates = true,
    is_ground_content = false,
    groups = { cracky=3, },
})

It is possible to create a workaround for this: Just add “tiles = { blank.png }” to the node definition. Then no particles appear. But I don't like this workaround and it is ugly. Unknown node particles should normally not appear.

Tested in 0.4.15.

[paramat]

I guess airlike nodes should not create any dig particles unless tiles are specified.