Workaround for previewing Talk pages that don't exist yet. #4631
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This is a workaround for our Preview endpoint, which returns an error if the target page doesn't exist yet.
We will now (silently) check if a Talk page exists while the user is typing a message, then call the Preview endpoint using the Main Page of the wiki, which produces acceptable results.
https://phabricator.wikimedia.org/T363781