IA import fails due to missing publisher

### Problem

### Reproducing the bug

Run the following (requires import permissions):

```js
await fetch("https://openlibrary.org/api/import/ia?identifier=richestmaninbaby0000geor_q8e2&require_marc=false", {
"credentials": "include",
"method": "POST",
"mode": "cors"
});
```

* Expected behavior: It imports the book
* Actual behavior: Errors with:

```json
{"success": false, "error_code": "not-differentiable", "error": "1 validation error for CompleteBook\npublishers\n Field required [type=missing, input_value={'title': 'the richest ma...aninbaby0000geor_q8e2']}, input_type=dict]\n For further information visit https://errors.pydantic.dev/2.4/v/missing"}
```

### Context

- Browser (Chrome, Safari, Firefox, etc):
- OS (Windows, Mac, etc):
- Logged in (Y/N):
- Environment (prod, dev, local): prod

### Breakdown

#### Requirements Checklist
* [ ]

#### Related files

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#### Stakeholders

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Reproduce the failure with the documented POST request to /api/import/ia using the supplied identifier. Search the import endpoint and the CompleteBook validation shown in the error to find why publishers is absent. Done means the identifier imports successfully without the not-differentiable validation error.

Written by the indexing model from the issue text.