Merge pull request #37 from jambonz/fix/appenv_root_path

Update validator.js

lib/validator.js

@@ -14,6 +14,7 @@ const schema = JSON.parse(fs.readFileSync(schemaPath, 'utf8'));
  * @returns {Object} - Result with { success: boolean, config: Object, error: string }
  */
 function getAppConfig({ urlPath, appJsonPath }) {
+  if (urlPath.length == 0) urlPath = '/';
   try {
     if (!appJsonPath) {
       return {