Gary Pendergast 000809964a WPDB: Check that AUTH_SALT is not empty.
In `wpdb::placeholder_escape()`, the key for `hash_hmac()` defaults to `AUTH_SALT`, but `hash_hmac()` will return an empty string if the key is empty.

This had the side effect of the string `{}` being incorrectly replaced with a `%` character in queries just about to be run on the database.

Props jsonfry.
Fixes #42431.



git-svn-id: https://develop.svn.wordpress.org/trunk@42120 602fd350-edb4-49c9-b593-d223f7449a82
2017-11-07 01:08:11 +00:00
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