If `DB_CHARSET` isn't defined (or is empty), `wpdb::$charset` will be empty, too. `wpdb::strip_invalid_text()` assumes that it isn't empty, however, so we need to fall back to the connection character set when we're running our sanity checks. Fixes #34708. git-svn-id: https://develop.svn.wordpress.org/trunk@35655 602fd350-edb4-49c9-b593-d223f7449a82
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