message: fix: fallback to event target when composed path unavailable
  fixes
diff: @@ -214,12 +214,10 @@ export class NgDropdownPanelComponent implements OnInit, OnChanges, OnDestroy {
  this._zone.runOutsideAngular(() => {
  fromEvent(this.scrollElementRef.nativeElement, 'scroll')
  .pipe(takeUntil(this._destroy$), auditTime(0, SCROLL_SCHEDULER))
  - .subscribe((e: { path, composedPath }) => {
  + .subscribe((e: { path, composedPath, target }) => {
  const path = e.path || (e.composedPath && e.composedPath());
  - if (!path) {
  - return
  - }
  - this._onContentScrolled(path[0].scrollTop);
  + const scrollTop = path.length === 0 ? e.target.scrollTop : path[0].scrollTop
  + this._onContentScrolled(scrollTop);
  });
  });
  }
  