Update packages/durabletask-js/src/client/client.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: YunchuWang

packages/durabletask-js/src/client/client.ts

@@ -614,7 +614,7 @@ export class TaskHubGrpcClient {
 
     return new OrchestrationState(
       instanceId,
-      name,
+      name ?? "",
       status,
       createdAt,
       lastUpdatedAt,