message: Fix 'missing page_type' error
  LoggedInView will complain if it is instantiated without a page_type, so let's
  keep showing the syncing spinner until we have one.
diff: @@ -1171,7 +1171,12 @@ module.exports = React.createClass({
  <PostRegistration
  onComplete={this.onFinishPostRegistration} />
  );
  - } else if (this.state.loggedIn && this.state.ready) {
  + }
  +
  + // `ready` and `loggedIn` may be set before `page_type` (because the
  + // latter is set via the dispatcher). If we don't yet have a `page_type`,
  + // keep showing the spinner for now.
  + if (this.state.loggedIn && this.state.ready && this.state.page_type) {
  /* for now, we stuff the entirety of our props and state into the LoggedInView.
  * we should go through and figure out what we actually need to pass down, as well
  * as using something like redux to avoid having a billion bits of state kicking around.
  