message: Removed redundant undefined crumb check
diff: @@ -15,7 +15,7 @@ class NavigationLink extends React.Component<NavigationLinkProps, NavigationLink
  static getDerivedStateFromProps({ acrossCrumbs, stateKey, navigationData, includeCurrentData, currentDataKeys, stateNavigator }, { crumb }) {
  var { crumbs, state } = stateNavigator.stateContext;
  - if (!acrossCrumbs && crumb !== undefined && crumb !== crumbs.length)
  + if (!acrossCrumbs && crumb !== crumbs.length)
  return null;
  try {
  var link = stateNavigator.getNavigationLink(stateKey, LinkUtility.getData(stateNavigator, navigationData, includeCurrentData, currentDataKeys));
  