def check_missing_fields(required_fields, request_data):
    if request_data is None:
        return [field for field in required_fields]
    missing_fields = [field for field in required_fields if field not in request_data]
    if missing_fields:
        return missing_fields

    missing_data = [data for data in required_fields if not request_data[data] or data == '' or data is None]
    return missing_data