No css files after webpack packaging?

Question

webpack

This is my first time using webpack and I still don't understand why I can't build vendor css files. Here is my webpack config:

const path = require('path');
const webpack = require('webpack');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const autoprefixer = require('autoprefixer');

module.exports = {
    entry: {
        vendor: [
            'jquery',
            'bootstrap-loader',
            'font-awesome-sass-loader!./config/font-awesome.config.js'
        ],
        'app': './src/app.js'
    },
    output: {
        path: path.resolve(__dirname, './public'),
        publicPath: '/public/',
        filename: 'js/[name].bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                loader: ExtractTextPlugin.extract({fallback: 'style-loader', use: 'css-loader'})
            },
            {
                test: /\.scss$/,
                loader: ExtractTextPlugin.extract({fallback: 'style-loader', use: 'css-loader!sass-loader'})
            },
            {
                test: /bootstrap\/dist\/js\/umd\//,
                use: 'imports-loader?jQuery=jquery'
            },
            {
                test: /\.vue$/,
                loader: 'vue-loader',
                options: {
                    loaders: {
                        'scss': 'vue-style-loader!css-loader!sass-loader',
                        'sass': 'vue-style-loader!css-loader!sass-loader?indentedSyntax'
                    }
                }
            },
            {
                test: /\.js$/,
                loader: 'babel-loader',
                exclude: /node_modules/
            },
            {
                test: /\.(png|jpe?g|gif|svg)$/,
                loader: 'file-loader',
                options: {
                    name: 'images/[name].[ext]?[hash]'
                }
            },
            {
                test: /\.(eot|woff|woff2|ttf|svg)(\?\S*)?$/,
                loader: 'file-loader',
                options: {
                    name: 'fonts/[name].[ext]?[hash]'
                }
            }
        ]
    },
    resolve: {
        alias: {
            'vue$': 'vue/dist/vue.esm.js'
        }
    },
    devServer: {
        historyApiFallback: true,
        noInfo: true
    },
    performance: {
        hints: false
    },
    devtool: '#eval-source-map'
};

if (process.env.NODE_ENV === 'production') {
    module.exports.devtool = '#source-map';
    // http://vue-loader.vuejs.org/en/workflow/production.html
    module.exports.plugins = (module.exports.plugins || []).concat([
        new ExtractTextPlugin({
            filename: 'css/[name].bundle.css',
            disable: false,
            allChunks: true
        }),
        new webpack.DefinePlugin({
            'process.env': {
                NODE_ENV: '"production"'
            }
        }),
        new webpack.ProvidePlugin({
            $: "jquery",
            jQuery: "jquery",
            "window.jQuery": "jquery",
            Tether: "tether",
            "window.Tether": "tether",
            Tooltip: "exports-loader?Tooltip!bootstrap/js/dist/tooltip",
            Alert: "exports-loader?Alert!bootstrap/js/dist/alert",
            Button: "exports-loader?Button!bootstrap/js/dist/button",
            Carousel: "exports-loader?Carousel!bootstrap/js/dist/carousel",
            Collapse: "exports-loader?Collapse!bootstrap/js/dist/collapse",
            Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown",
            Modal: "exports-loader?Modal!bootstrap/js/dist/modal",
            Popover: "exports-loader?Popover!bootstrap/js/dist/popover",
            Scrollspy: "exports-loader?Scrollspy!bootstrap/js/dist/scrollspy",
            Tab: "exports-loader?Tab!bootstrap/js/dist/tab",
            Util: "exports-loader?Util!bootstrap/js/dist/util"
        }),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true,
            compress: {
                warnings: false
            }
        }),
        new webpack.LoaderOptionsPlugin({
            minimize: true,
            options: {
                postcss: [autoprefixer],
            }
        })
    ])
}