limit number of js files minified, dont crash upgrade script of widget-settings is not found

src/meta/minifier.js

@@ -168,7 +168,7 @@ function concat(data, callback) {
 actions.concat = concat;
 
 function minifyJS_batch(data, callback) {
-	async.each(data.files, function (fileObj, next) {
+	async.eachLimit(data.files, 100, function (fileObj, next) {
 		fs.readFile(fileObj.srcPath, 'utf8', function (err, source) {
 			if (err) {
 				return next(err);

src/widgets/admin.js

@@ -5,6 +5,7 @@ var path = require('path');
 var async = require('async');
 var nconf = require('nconf');
 var benchpress = require('benchpressjs');
+var winston = require('winston');
 
 var plugins = require('../plugins');
 var groups = require('../groups');
@@ -85,7 +86,7 @@ function renderAdminTemplate(callback) {
 	async.waterfall([
 		function (next) {
 			async.parallel({
-				source: async.apply(fs.readFile, path.resolve(nconf.get('views_dir'), 'admin/partials/widget-settings.tpl'), 'utf8'),
+				source: async.apply(getSource),
 				groups: async.apply(groups.getNonPrivilegeGroups, 'groups:createtime', 0, -1),
 			}, next);
 		},
@@ -95,3 +96,12 @@ function renderAdminTemplate(callback) {
 		},
 	], callback);
 }
+
+function getSource(callback) {
+	fs.readFile(path.resolve(nconf.get('views_dir'), 'admin/partials/widget-settings.tpl'), 'utf8', function (err, source) {
+		if (err) {
+			winston.error(err);
+		}
+		callback(null, source || '');
+	});
+}