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4ee40e3ff1
This change improves the `esc_xml()` function by replacing two `empty()` checks with `isset()` to cover values that are not equal to `''` but still returning `true` when checked with `empty()`, like `'0'`, `0` or `false`. It also updates the related unit tests accordingly. Props rumpel2116, pbiron. Fixes #55399. git-svn-id: https://develop.svn.wordpress.org/trunk@53144 602fd350-edb4-49c9-b593-d223f7449a82