build: remove postcss-drop-empty-css-vars

Author: mrholek

build/postcss.config.js

@@ -10,7 +10,6 @@ module.exports = context => {
   return {
     map: context.file.dirname.includes('examples') ? false : mapConfig,
     plugins: {
-      'postcss-drop-empty-css-vars': {},
       autoprefixer: {
         cascade: false
       },

package-lock.json

@@ -130,7 +130,6 @@
     "postcss": "^8.4.23",
     "postcss-cli": "^10.1.0",
     "postcss-combine-duplicated-selectors": "^10.0.3",
-    "postcss-drop-empty-css-vars": "^0.0.0",
     "rollup": "^3.21.5",
     "rollup-plugin-istanbul": "^4.0.0",
     "rtlcss": "^4.1.0",