NullReferenceException when using CloseHandler

[szehetner]

Connecting with a CloseHandler passed via the Context causes a NullReferenceException:

var ctx = new Aeron.Context()
                .CloseHandler(() => { });
var aeron = Aeron.Connect(ctx);

causes a NullReferenceException here:

Adaptive.Aeron.dll!Adaptive.Aeron.Aeron.NextCorrelationId() Line 347	
Adaptive.Aeron.dll!Adaptive.Aeron.ClientConductor.ClientConductor(Adaptive.Aeron.Aeron.Context ctx, Adaptive.Aeron.Aeron aeron) Line 127	
Adaptive.Aeron.dll!Adaptive.Aeron.Aeron.Aeron(Adaptive.Aeron.Aeron.Context ctx) Line 68	
Adaptive.Aeron.dll!Adaptive.Aeron.Aeron.Connect(Adaptive.Aeron.Aeron.Context ctx) Line 117	

The reason seems to be that the ClientConductor ctor tries to get a NextCorrelationId(), but this in turn needs the Aeron._clientConductor that has not been constructed yet and is still null.

Note: A workaround for this is to not use the Context.CloseHandler() but instead use Aeron.AddCloseHandler() after connecting. I noticed the issue when upgrading from 1.29.0 to 1.39.0, so it must have been introduced between those versions.