Empty @media queries generated when compiling less file with (reference) to bootstrap  #269

Installed product versions

• Visual Studio: 2015 Professional
• This extension: 1.11.319

Description

Empty @media queries generated when compiling less file with (reference) to bootstrap

Steps to recreate

1. Download bootstrap less files from http://getbootstrap.com/getting-started/#download

2. Create a less file with a reference import to bootstrap.less and use a mixin:
   

3. Compile your less file

Current behavior

The css file contains many empty @media queries

Expected behavior

The css file should not contain empty @media queries
.mybutton { padding: 1px 1px; font-size: 1px; line-height: 1px; border-radius: 1px; }