Environment
Provide version numbers for the following components (information can be retrieved by runningtns info in your project folder or by inspecting thepackage.json of the project):

• CLI: 6.1.2
• nativescript-dev-webpack: 1.2.1

Describe the bug
Create a project and make css to be custom. When you run an app, you will see that it will crash.

To Reproduce

1. tns create app --js
2. renameapp.css tonew.css
3. addapplication.setCssFileName("new.css"); inapp.js
4. tns run android
5. app will run and if you make a change it will apply but you can see an error in a console log: JS:Error: Could not load CSS from app.css: Error: require’s first parameter should be string

Expected behavior
works without error in console log