**Steps to replicate the issue**:
* Create a sandbox page in the main namespace of a wiki.
* Change its content model to plain text. You can do this via `Special:ChangeContentModel/pagename`
* Go to `Special:DeadEndPages`.
**What happens?**:
The page gets listed in `Special:DeadEndPages`
**What should have happened instead?**:
This is technically a dead-end page as it has no wikilinks. On the other hand, this is essentially a feature that can't be changed. You can even add pseudolinks like `[[Foo]]` to the page, and they're not parsed.
**Other thoughts**:
If a page is something else that doesn't have any links from it for some reason, that would presumably have similar behaviour.
If a page has another content model, like Markdown or HTML, but actually contains links, would that throw a false positive?
So should this check that a page is wikitext before checking for no links.