Fix activity listener

Author: stevejgordon

src/Elastic.Apm/OpenTelemetry/ElasticActivityListener.cs

@@ -407,9 +407,9 @@ static string ToResourceName(string type, string name)
 					span.Type = ApiConstants.TypeUnknown;
 			}
 
-			if (serviceTargetType is not null && serviceTargetName is not null && resource is not null)
+			span.Context.Service = new SpanService(new Target(serviceTargetType, serviceTargetName));
+			if (resource != null)
 			{
-				span.Context.Service = new SpanService(new Target(serviceTargetType, serviceTargetName));
 				span.Context.Destination ??= new Destination();
 				span.Context.Destination.Service = new Destination.DestinationService { Resource = resource };
 			}