fixes

ui/hv2-ui/src/app/flat-details/flat-details.component.ts

@@ -44,11 +44,17 @@ export class FlatDetailsComponent implements OnInit {
   async getFlat(): Promise<void> {
     try {
       const id = +this.route.snapshot.paramMap.get('id')
+      this.messageService.add(`getFlat ${id}`)
       if (id != 0) {
         this.flat = await this.flatService.getFlat(id)
         this.premise = await this.premiseService.getPremise(this.flat.premise)
         this.mappedOverheadAdvances = await this.extApiService.getOverheadAdvancesByFlat(this.flat.id)
         this.dataSource = new MatTableDataSource<OverheadAdvance>(this.mappedOverheadAdvances)
+      } else {
+        this.flat = NULL_Flat
+        this.premise = NULL_Premise
+        this.mappedOverheadAdvances = undefined
+        this.dataSource = undefined
       }
     } catch (err) {
       throw err
@@ -116,6 +122,7 @@ export class FlatDetailsComponent implements OnInit {
   }
 
   ngOnInit(): void {
+    this.messageService.add("FlatDetailsComponent.ngOnInit")
     this.getPremises()
     this.getOverheadAdvances()
     this.getFlat()