bug(): CORS response Error

#### Issue Description
On a CORS check that is invalid, an internal service error is thrown because of an error that is not resolved:

```sh
TypeError: Cannot read property 'error' of undefined at 500 (/app/node_modules/@fabrix/spool-express/dist/config/web.js:78:25) 
```

#### Environment
- node version: 10.0.0
- fabrix version: 1.1.4
- operating system: Linux/MacOS
