title: Angular ERROR: PostCSS received undefined instead of CSS string
body: <p>Trying to build an Angular project and I'm getting the errors below. This project built fine last week. I made some changes to other projects that use the Dlls from this project, but no changes to this project. I already spent a lot of time troubleshooting it with no luck and appreciate any help.</p>
  <blockquote>
  <p>ERROR: PostCSS received undefined instead of CSS string
  An unhandled exception occurred: PostCSS received undefined instead of CSS string</p>
  </blockquote>