How to create IF statement to check for objects in a list inside JSON data?

This following datastructure is in JSON. I want to know how I can write an if statement to check if there are any objects inside the key causes_virtual. I have tried using both if len(api_response_article[0]['causes_virtual']) == 0: or if not api_response_article[0]['causes_virtual']: , however neither of these works. Could this be because there are dictionaries inside of a list

{
    "additional_info": "",
    "approved_at": null,
    "approved_by_id": null,
    "causes_virtual": [           # THIS SECTION
        {
            "id": 5408600,
            "models": [
                "Potatoes"
            ],
            "principals": "Some irrelevant text",
            "title": "We farm potatoes or something"
        }
    ],
    "created_at": "2021-03-03T01:13:04.477348+00:00",
    "created_by_id": 1019500
}

Any pointers would be helpful. Thanks in advanced!