message: fix(dropdown): fix view destroyed error
diff: @@ -82,6 +82,14 @@ export class BsDropdownToggleDirective implements OnDestroy {
  }
  ngOnDestroy(): void {
  + if (this._documentClickListener) {
  + this._documentClickListener();
  + }
  +
  + if (this._escKeyUpListener) {
  + this._escKeyUpListener();
  + }
  +
  for (const sub of this._subscriptions) {
  sub.unsubscribe();
  }
  