message: Send empty auth key value pair if doing FallbackStage
  Took 3 minutes
diff: @@ -740,7 +740,7 @@ export const FallbackAuthEntry = createReactClass({
  event.data === "authDone" &&
  event.origin === this.props.matrixClient.getHomeserverUrl()
  ) {
  - this.props.submitAuthDict({});
  + this.props.submitAuthDict(null);
  }
  },
  