Bug in AgentRuntime.cs RpcRequest scp update()

[rysweet]

What happened?

public void Update(RpcRequest request, Activity? activity = null)
    {
        DistributedContextPropagator.Inject(activity, request.Metadata, static (carrier, key, value) => ((IDictionary<string, string>)carrier!)[key] = value);
    }

if key isn't already defined this will throw

What did you expect to happen?

safety!

How can we reproduce it (as minimally and precisely as possible)?

send an RpcRequest with no metadata

AutoGen version

0.4

Which package was this bug in

Core

Model used

No response

Python version

No response

Operating system

No response

Any additional info you think would be helpful for fixing this bug

No response