KST-23: fix issue with new history creation

src/app/core/service-detail/service-detail.component.ts

@@ -130,6 +130,9 @@ export class ServiceDetailComponent implements OnInit {
     this.servicesService.getServiceById(this.id).subscribe(
       (s) => {
         this.service = s;
+        if (this.service.history == null) {
+          this.service.history = new Array;
+        }
         this.isLoading = false;
       },
       (error) => {