message: Adding a nullcheck in chart.ts
diff: @@ -3,7 +3,8 @@ import * as ui from "../ui";
  // tslint:disable-next-line:no-string-literal
  const Microsoft = typeof window !== "undefined" ? window["Microsoft"] : undefined;
  -export const DefaultHost = Microsoft ? new Microsoft.Charts.Host({ base: "https://charts.microsoft.com" }) : null;
  +export const DefaultHost = (Microsoft && Microsoft.Charts) ?
  + new Microsoft.Charts.Host({ base: "https://charts.microsoft.com" }) : null;
  export class Chart extends ui.Component {
  private chart: any;
  