can't retrieve manufacturer and model information
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**Describe The Problem:**
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Errors reported in log about retrieving Manufacturer and Model information. Otherwise, operation seems okay.
**To Reproduce:**
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Restart Hoobs, happens each time.
**Logs:**
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```
3/3/2021, 9:32:57 AM [myQ] myQ API: Discovered device family garagedoor: Garage Door (serial number: CG08009AC18B, gateway: GW33000AF1C1).
3/3/2021, 9:32:57 AM [myQ] myQ API: Discovered device family gateway: Hub (serial number: GW33000AF1C1).
3/3/2021, 9:32:57 AM [myQ] Garage Door: Adding garagedoor device to HomeKit: Garage Door (serial number: CG08009AC18B, gateway: GW33000AF1C1).
3/3/2021, 9:32:59 AM [HOOBS RPi 91L 1449@Garage Door@@Manufacturer] characteristic value expected string and received undefined
3/3/2021, 9:32:59 AM [HOOBS RPi 91L 1449@Garage Door@@Model] characteristic value expected string and received undefined
3/3/2021, 9:32:59 AM [myQ] Garage Door: Closed.```

**Homebridge Configuration:**

```json
Show the relevant portion of your homebridge config.json here, if needed.
Remove any sensitive information.
```

**Screenshots:**
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**Environment:**

* **Homebridge Version:** <!-- homebridge -V --> 3.3.3
* **Node Version:** <!-- node -v --> 14.15.1
* **Homebridge-myQ Plugin Version**: 2.6.2
* **Apple Device and iOS / macOS / iPadOS / tvOS Version:**<!-- Type of Apple device you're using and associated OS version --> IPhone XS, current iOS
* **Operating System and OS Version:** <!-- Raspbian / Ubuntu / Debian / Windows / macOS / Docker -->
5.10.11+
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