Visit this endpoint for a `MediaWiki:` interface message that's overridden on the local wiki, e.g. https://fr.wikipedia.org/w/rest.php/v1/page/MediaWiki:Editcheck-config.json/html
Observe the following error: `{"message":"Error: exception of type InvalidArgumentException","httpCode":500,"httpReason":"Internal Server Error"}`
Note that the top-level page API for the message shows its source correctly (https://fr.wikipedia.org/w/rest.php/v1/page/MediaWiki:Editcheck-config.json), unlike in T349677 where that endpoint fails for non-overridden messages.
A wiki with the message //not// overridden (https://nah.wikipedia.org/w/rest.php/v1/page/Huiquimedia%3AEditcheck-config.json/with_html) does show the `with_html` endpoint correctly, though not the base one.
Note that this works fine for messages that have wikitext content, e.g. https://fr.wikipedia.org/w/rest.php/v1/page/MediaWiki:Abusefilter/html
----
~~Exception message: "ParserOutput does not have a render ID"~~
Exception message: "Failed to find content language in page bundle data"
Stack trace:
```
from /srv/mediawiki/php-1.42.0-wmf.20/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(614)
#0 /srv/mediawiki/php-1.42.0-wmf.20/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(629): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getHtmlOutputContentLanguage()
#1 /srv/mediawiki/php-1.42.0-wmf.20/includes/Rest/Handler/PageHTMLHandler.php(137): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->putHeaders(MediaWiki\Rest\Response, boolean)
#2 /srv/mediawiki/php-1.42.0-wmf.20/includes/Rest/SimpleHandler.php(40): MediaWiki\Rest\Handler\PageHTMLHandler->run(string)
```