Fixed uncaught exception which was not allowing execution of  "mochaTest:appiumutils" (mochaTest) task. In server.js the gridRegister.registerNode(args.nodeconfig) was getting executed if args.nodeconfig is not null. In the appiumutils.js it was not set as null.
Merge pull request #861 from samaitra/master

Fixed uncaught exception which was not allowing execution of  "mochaTest:appiumutils" (mochaTest) task. In server.js the gridRegister.registerNode(args.nodeconfig) was getting executed if args.nodeconfig is not null. In the appiumutils.js it was not set a