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kotlinlang

It seems like `http4k-contract` generates a `servers` section like this if you don't specify any servers:
```  "servers": [
    {
      "url": "/",
      "description": null
    }
  ]```
It would make more sense to not generate any `servers` section in this case.

from the open api docs:
```An array of Server Objects, which provide connectivity information to a target server. If the servers property is not provided, or is an empty array, the default value would be a Server Object with a url value of /.```

Right, then it is valid if the `"description": null` is removed.

the problem is that the renderer for the API docs always includes nulls (to cope with other bits of the spec)