ionic-framework: NavController.loadPage does not handle promise rejection

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Short description of the problem:

When you have an error in a second level page it does not propagate to the top level and it is not showed in the console

What behavior are you expecting?

Show errors in the console for all pages

Steps to reproduce:

1. Create a start project ionic start test --v2 --ts
2. Create a Page4
3. Add an error in Page4. Like undefined error. 4.Do this.nav.push(Page4); in Page1
4. Error will not be showed

This on Page1

goToPage4() {
    this.nav.push(Page4).then(
      response => {
        console.log('Response ' + response);
      },
      error => {
        console.log('Error: ' + error);
      }
    ).catch(exception => {
      console.log('Exception ' + exception);
    });;
  }

Other information: (e.g. stacktraces, related issues, suggestions how to fix, stackoverflow links, forum links, etc) https://forum.ionicframework.com/t/ionic-2-error-not-showing-in-nav-push-somepage/49418/7

Which Ionic Version? 1.x or 2.x 2…0.0-beta.4

Plunker that shows an example of your issue

http://plnkr.co/edit/OBQjWnCgVkf7Z7mXezBs

Here it works but if you do it on a real project it does not.

Run ionic info from terminal/cmd prompt: (paste output below) Cordova CLI: 6.1.1 Gulp version: CLI version 3.9.0 Gulp local: Local version 3.9.1 Ionic CLI Version: 2.0.0-beta.17 Ionic App Lib Version: 2.0.0-beta.8 ios-deploy version: 1.7.0 ios-sim version: 4.1.1 OS: Mac OS X El Capitan Node Version: v5.10.1 Xcode version: Xcode 7.3 Build version 7D175