css min isn't updated if compiled css is empty or null

[mattheiler]

Look at /src/WebCompiler/Minify/FileMinifier.cs, line 82:

80            string result = minifier.MinifyStyleSheet(content, settings);
81
82            if (!string.IsNullOrEmpty(result))

If the CSS compiler result is empty, the CSS min file isn't written.
The result of compiling the following SASS is an empty\null string...

.main > .main-body {
  // .style-me { }
}

This could also an be issue with JS, but is prevented by "use strict", which is added by the compiler, always forcing the JS min file to be written.

Consider either cleaning the original file, if it exists, or always minifying.