Fixed error return when invalid login

lib/zimbra-admin-api.js

@@ -175,7 +175,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	      this.client.auth(auth_object, function (err, response) {
 	        that.secret = null;
 	        that.password = null;
-	        if (err) return (callback || that.handleError)(err);
+	        if (err) return callback(that.handleError(err));
 	        return (callback || that.handleResponse)(null, response);
 	      });
 	    }

src/index.js

@@ -82,7 +82,7 @@ export default class ZimbraAdminApi {
     this.client.auth(auth_object, function(err, response){
       that.secret = null;
       that.password = null;
-      if (err) return (callback || that.handleError)(err);
+      if (err) return callback(that.handleError(err));
       return (callback || that.handleResponse)(null, response);
     });
   }

test/js/spec/test.js

@@ -110,6 +110,20 @@
       api.login(callback);
     });
 
+    it('should return Error with wrong Login', function(done){
+      let auth_obj = {
+        'url': 'http://zimbra.zboxapp.dev:8000/service/admin/soap',
+        'user': 'admin@zboxapp.dev',
+        'password':'12345678910'
+      }
+      let api = new ZimbraAdminApi(auth_obj);
+      api.login(function(err, data){
+        expect(err.extra.code).to.be.equal("account.AUTH_FAILED");
+        expect(err.extra.reason).to.match(/authentication failed/);
+        done();
+      });
+    });
+
     it('should return directorySearch with total info', function(done){
       let api = new ZimbraAdminApi(auth_data);
       let query_object = {limit: 10, domain: 'customer.dev', types: "accounts"};