fix WS carta params error

apps/web/src/app/workspaces/components/capability-request/components/request-operations/request-operations.component.ts

@@ -95,11 +95,13 @@ export class RequestOperationsComponent implements OnInit {
   };
 
   launchCarta($event) {
+
+    let email = this.userEmail != null ? this.userEmail : "n/a"
     let params = {
       need_data: false,
       notify_ready: true,
       product_locator: null,
-      user_email: this.userEmail,
+      user_email: email,
       parent_wf_request_id: this.selectedVersion.current_execution.current_workflow_request_id,
     };
     this.workflowLauncherService