make config params optional

lib/tests/test.js

@@ -121,6 +121,10 @@ class Test {
 
   config(options, callback) {
     const self = this;
+    if (typeof(options) === 'function') {
+      callback = options;
+      options = {};
+    }
     if (!callback) {
       callback = function () {
       };

test_apps/test_app/test/simple_storage_deploy_spec.js

@@ -2,7 +2,7 @@
 const SimpleStorage = embark.require('Embark/contracts/SimpleStorage');
 let accounts;
 
-config({}, (err, theAccounts) => {
+config((err, theAccounts) => {
   accounts = theAccounts;
 });