Gulpfile error swallowing failure case

gulpfile.js

'use strict';

const path = require('path');
const net = require("net");

const gulp = require('gulp');
const rename = require('gulp-rename');
const plumber = require('gulp-plumber');
const livereload = require('gulp-livereload');
const nodemon = require("gulp-nodemon");
const webpackStream = require("webpack-stream");
const webpack = require("webpack");
const namedLog = require("gulp-named-log");

const spy = require("through2-spy");

/* The following resolves JacksonGariety/gulp-nodemon#33 */
process.once("SIGINT", function() {
	process.exit(0);
});

gulp.task('webpack', function(){
	console.log("one");
	
	try {
		var wp = webpackStream({
			watch: true,
			module: {
				preLoaders: [{ test: /\.tag$/, loader: "riotjs-loader", exclude: /node_modules/, query: { type: "babel", template: "jade" } }],
				loaders: [
					{
						test: /\.js/,
						loader: "babel-loader",
						query: JSON.parse(fs.readFileSync("./.babelrc"))
					},
					{ test: /\.json$/, loader: "json-loader" },
				]
			},
			plugins: [ new webpack.ProvidePlugin({riot: "riot"}) ],
			resolve: {
				extensions: [
					"",
					".tag",
					".web.js", ".js",
					".web.json", ".json"
				]
			}
		});
	} catch (err) {
		console.err("error", err);
	}
	
	console.log("two");
	
	
	return gulp.src("./src/index.js")
		.pipe(plumber())
		.pipe(wp)
		.pipe(rename("bundle.js"))
		.pipe(namedLog("webpack").stream())
		.pipe(livereload())
		.pipe(gulp.dest("./public/js"));
});

function checkServerUp(){
	setTimeout(function(){
		var sock = new net.Socket();
		sock.setTimeout(50);
		sock.on("connect", function(){
			console.log("Triggering page reload...");
			livereload.changed("*");
			sock.destroy();
		})
		.on("timeout", checkServerUp)
		.on("error", checkServerUp)
		.connect(5000);
	}, 70);
}

gulp.task('watch', function () {
	livereload.listen();
	gulp.watch(['./**/*.css', 'package.json', "./public/js/**/*.js"]).on('change', livereload.changed);
	gulp.watch(['public/views/**/*.html', 'public/elements/**/*']).on('change', function() { livereload.changed("*"); });

	nodemon({script: "./server.js", ext: "coffee", delay: 500}).on("start", checkServerUp);
});

gulp.task("default", ["watch", "webpack"]);

output.log

sven@linux-etoq:~/projects/riot-todo> gulp
one
[07:35:00] [nodemon] 1.9.1
[07:35:00] [nodemon] to restart at any time, enter `rs`
[07:35:00] [nodemon] watching: *.*
[07:35:00] [nodemon] starting `node ./server.js`
Triggering page reload...