Added Todo comment and documentation

Author: ahmedetefy

packages/serverless/src/awslambda.ts

@@ -258,7 +258,9 @@ export function wrapHandler<TEvent, TResult>(
       name: context.functionName,
       op: 'awslambda.handler',
       ...traceparentData,
-      metadata: { tracestate: tracestateData },
+      // ToDo check with Katie if this should be here even if undefined
+      // metadata: { tracestate: tracestateData },
+      ...(tracestateData && { metadata: { tracestate: tracestateData } }),
     });
 
     const hub = getCurrentHub();