Fix mutated property

pages/workflow.vue

@@ -47,14 +47,11 @@ import ExampleModuleMessaging from '@digital-earth/frontend-framework/lib/messag
 import { PulsarProgressReport } from '@digital-earth/frontend-framework/lib/messaging/PulsarMessages';
 
 @Component({
-  components: { Demap, ProgressDialog },
-  props: {
-    progressReport: PulsarProgressReport
-  }
+  components: { Demap, ProgressDialog }
 })
 export default class Workflow extends Vue {
   private exampleModule: ExampleModuleMessaging = new ExampleModuleMessaging();
-  private progressReport: PulsarProgressReport;
+  private progressReport: PulsarProgressReport = new PulsarProgressReport();
 
   protected sendRequest(): void {
     this.exampleModule.sendRequest((progressReport: PulsarProgressReport) => {