Boone Gorges e5e467a41b Allow metadata to be deleted when meta_value matches 0 or '0'.
In `delete_metadata()`, be stricter about when to ignore a falsey value of
`$meta_value`.

For backward compatibility, an empty string for `$meta_value` is equivalent to
`null` or `false`.

Props sc0ttkclark.
Fixes #32224.

git-svn-id: https://develop.svn.wordpress.org/trunk@32331 602fd350-edb4-49c9-b593-d223f7449a82
2015-05-01 16:37:35 +00:00
2015-03-13 18:11:33 +00:00
2015-04-23 17:59:53 +00:00
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