How do I use the OR operator (bar, |) with BibTeX citekey formualae?

Scenario: I have several items in my Zotero library that do not have any specific author; they only have a publisher.

I want to have my citekey be set to one of these two, depending on if the author field is present:

```
johnDoe.2023.zoteroForumPost
johnDoePublishing.2023.someVideo
```

Here's what I have so far:

```
auth.lower|Publisher.lower + "." + year + "." + shorttitle(3,3)
```

However, if the author field is present, the citekey gets set to this:

```
johnDoe
```

The items that have a publisher with no authors get set to my desired output:

```
johnDoePublishing.2023.someVideo
```

How would I get the desired style of citekey formatting?
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