Upgrade MediaWiki 1.27 to 1.39 and avoid “There is currently no text in this page” error

After upgrading MediaWiki from 1.31 (or earlier) to 1.35 (or later), some pages may lose their content, with an error message There is currently no text in this page. If a user tried to edit, it will print another error message The revision #0 of the page named "……" does not exist.

This article provides an upgrade path from 1.27 to 1.39 and avoids the issue.

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