Question: Why doesn't RequestExceptionProcessorBehavior support null responses?

[tonycoelho]

RequestExceptionProcessorBehavior.Handle() doesn't support the ability to return a null response, i.e.:

if (!state.Handled)
{
    throw;
}

if (state.Response is null)
{
    throw;
}

return state.Response; //cannot be null if Handled

What is the reason for this? There are legitimate use cases where you might want to return a null response when an exception is handled.