WebPack loader issues

[jayeshanandani]

Note: for support questions, please use one of these channels:

https://forum.ionicframework.com/
http://ionicworldwide.herokuapp.com/

Short description of the problem:

On some instances even when there are no errors web pack throws:
Final loader didn't return a Buffer or String

What behavior are you expecting?

Webpack doesn't throws that error or shows some meaningful message.

insert any relevant code between the above and below backticks

Which @ionic/app-scripts version are you using?
0.047

Other information: (e.g. stacktraces, related issues, suggestions how to fix, stackoverflow links, forum links, etc)
Cordova CLI: 6.4.0
Ionic CLI Version: 2.1.17
Ionic App Lib Version: 2.1.7
ios-deploy version: 1.9.0
ios-sim version: 5.0.12
OS: OS X El Capitan
Node Version: v4.6.0
Xcode version: Xcode 7.3.1 Build version 7D1014

[danbucholtz]

Duplicate of #466

Going to close and track it there.

Thanks,
Dan