def METHOD_NAME(first: AverageType, second: AverageType) -> AverageType:
    """
    Helper to deal with Nones.
    We are "clever" in how we aggregate SlotF1Metrics (See SlotMetrics `__init__`) in
    that we add precision and recall values separately, but this means we need to handle
    None.
    """
    if first is None:
        return second
    if second is None:
        return first
    return first + second