Loot table random chance examples

Using compared weights with empty item:

{
    "pools": [
        {
            "rolls": 1,
            "items": [
                {
                    "item": "minecraft:diamond",
                    "weight": 1
                },
                {
                    "weight": 1
                }
            ]
        }
    ]
}

Using random_chance:

{
    "pools": [
        {
            "rolls": 1,
            "items": [
                {
                    "item": "minecraft:diamond",
                    "weight": 1,
                    "conditions": [
                        {
                            "condition": "random_chance",
                            "chance": 0.5
                        }
                    ]
                }
            ]
        }
    ]
}