Load hash based styles in error.html, too

scripts/webpack/webpack.common.js

@@ -47,7 +47,7 @@ module.exports = {
       },
       {
         test: /\.html$/,
-        exclude: /index\.template.html/,
+        exclude: /(index|error)\.template\.html/,
         use: [
           { loader: 'ngtemplate-loader?relativeTo=' + (path.resolve(__dirname, '../../public')) + '&prefix=public' },
           {