[Ring] Error connecting to API & TypeError: Cannot read property 'filter' of undefined
<!--
Please DO NOT DELETE THIS TEMPLATE or your issue may be closed immediately.
Before opening an issue, search for open and closed GitHub issues that match your situation.

If this is a Live Stream issue please go back and use the Live Streaming issue template.
-->

# Bug Report

### Describe the Bug
<!-- ✍️edit: --> I installed HOOBS over the weekend on my raspberry Pi, and I installed the homebridge-ring plugin. I followed the steps provided, including creating the refresh token, and saved. As of today, I still am unable to see any of my devices and i get the following errors in the log: 


### To Reproduce
Steps to reproduce the behavior:
 - install Hoobs plugin, configure Refresh token and safe. 
 - Go to devices and you'll see nothing there (relating to Ring). 
 - Go to logs. 
 - See error. 

### Expected behavior
<!-- ✍️edit: --> 

Normally i should be able to add my ring devices, but i can't even connect to the API. 


### Screenshots/Logs
<!-- ✍️edit: --> 

```
6/23/2020, 1:21:04 PM [Ring] Error connecting to API
6/23/2020, 1:21:04 PM [Ring] TypeError: Cannot read property 'filter' of undefined
    at RingApi.<anonymous> (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/api.js:141:18)
    at Generator.next (<anonymous>)
    at fulfilled (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/api.js:5:58)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
```

### Additional context
<!-- ✍️edit: --> Add any other context about the problem here.

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```

{
            "platform": "Ring",
            "plugin_map": {
                "plugin_name": "homebridge-ring"
            },
            "refreshToken": "[REFRESH TOKEN DELETED, AS REQUESTED, FOR BEING SENSITIVE INFO",
            "hideUnsupportedServices": false,
            "hideLightGroups": false,
            "hideDoorbellSwitch": false,
            "hideCameraMotionSensor": false,
            "hideCameraSirenSwitch": false,
            "hideInHomeDoorbellSwitch": false,
            "hideAlarmSirenSwitch": false,
            "debug": true,
            "cameraDingsPollingSeconds": 0,
            "locationModePollingSeconds": 0,
            "hideDeviceIds": [],
            "locationIds": []
        }

```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian 
 - Node.js: v12.16.3
 - NPM: 6.14.4
 - homebridge-ring: 9.3.3
 - homebridge: [e.g. 0.4.50 or N/A]
 - hoobs: 3.2.6
