Remove object from array if it contains key: value is null

I have a flask API that consumes SQL queries using SQL Alchemy

Sometimes I have objects in my array that contains null values, I would like to remove them but havent been succesful in my attempts..

class SliceData(Resource):
  def get(self, axis_choice, legend_choice, year_choice):
    connection = db_connect.connect()
    query = select([
                    getattr(workers.c, axis_choice),
                    getattr(workers.c, legend_choice),
                    func.count(workers.c.id).label('count')
                    ])
    query = query.where(workers.c.year == year_choice)
    query = query.group_by( getattr(workers.c, legend_choice), getattr(workers.c, axis_choice))
    result = connection.execute(query)
    return jsonify({'data': [dict(row) for row in result]})

The code above outputs JSON data that looks like this

{
    "data": [
        {
            "age": 46,
            "count": 33,
            "years_training": 2
        },
        {
            "age": 32,
            "count": 67,
            "years_training": 0
        },
        {
            "age": 51,
            "count": 1262,
            "years_training": null
        },
    ]
}

I have tried getting rid of null values using SQLAlchemy with query = query.where(workers.c.years_training !=None)

but that ends up changing the query

So I would like to remove the objects that have null values in my return jsonify so that my output looks like this

{
        "data": [
    {
        "age": 46,
        "count": 33,
        "years_training": 2
    },
    {
        "age": 32,
        "count": 67,
        "years_training": 0
    },
        ]
    }