postcss-discard-empty 
Discard empty rules and values with PostCSS.
Install
With npm do:
npm install postcss-discard-empty --save
Example
For more examples see the tests.
Input
@font-face;
h1 {}
{color:blue}
h2 {color:}
h3 {color:red}
Output
h3 {color:red}
Usage
See the PostCSS documentation for examples for your environment.
Contributing
Pull requests are welcome. If you add functionality, then please add unit tests to cover it.
License
MIT © Ben Briggs