comment errors from gulp-minify-css
comment errors from gulp-minify-css

gulp-minify-css/node_modules/clean-css/lib/properties/processable.js:107
      if (splitval.length === 0 || (splitval.length < descriptor.components.le
                  ^
TypeError: Cannot read property 'length' of null
xpush/stalk.io,xpush/io.stalk.static,xpush/stalk.io,xpush/io.stalk.static