Pieter Vermeersch

ContextPropagation throws an ArgumentNullException when the Activity.Current.Baggage contains a key with value null

4

### Describe the bug #### Description Method `Uri.EscapeDataString` called on [Line 24 of the ContextPropagation](https://github.com/Particular/NServiceBus/blob/master/src/NServiceBus.Core/OpenTelemetry/Tracing/ContextPropagation.cs#L24) class throws an ArgumentNullException when the baggage property of the activity parameter contains a key...