message: Fix overview type being downcasted to a generic string
diff: @@ -111,10 +111,17 @@ export class OverviewToolbar extends React.Component<Props, State> {
  this.setState({ isSortAscending: newDir });
  };
  - updateOverviewType = (otype: OverviewType) => {
  + updateOverviewType = (otype: String) => {
  + const isOverviewType = (val: String): val is OverviewType =>
  + val === 'app' || val === 'workload' || val === 'service';
  +
  + if (isOverviewType(otype)) {
  HistoryManager.setParam(URLParam.OVERVIEW_TYPE, otype);
  this.setState({ overviewType: otype });
  this.props.onRefresh();
  + } else {
  + throw new Error('Overview type is not valid.');
  + }
  };
  render() {
  