message: fix(LoadingOverlay): fix for portal already loaded error
  When using the async pipe and a nested value the portal could be reinitialized without first tearing
  down the portal
  ISSUES CLOSED:
diff: @@ -43,7 +43,8 @@ export class TsLoadingOverlayDirective implements OnInit, OnDestroy {
  */
  @Input()
  public set tsLoadingOverlay(value: boolean) {
  - const shouldSet = value;
  + const shouldSet = value && (this.bodyPortalHost && !this.bodyPortalHost.hasAttached());
  +
  if (shouldSet) {
  this.bodyPortalHost.attach(this.loadingOverlayPortal);
  } else {
  