QinQ role not nullable

[Etibru]

Deployment Type

Self-hosted

NetBox Version

v4.2.7

Python Version

3.10

Steps to Reproduce

1. Create (or update) a vlan like this (with the qinq_role as null):

{
  "name": "Test",
  "vid":8,
  "status": "active",
  "description": "Hey",
  "qinq_role": null
}

Expected Behavior

Normally this would set the role to null

Observed Behavior

400 / Error: Bad Request

{
  "qinq_role": [
    "This field may not be blank."
  ]
}

[Etibru]

I've just tested on the demo instance, the problem is also present in 4.3.0 :(

[Etibru]

if you accept it, you can assign it to me, I've found the fix :)