Boone Gorges 11226f02a8 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.
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git-svn-id: http://core.svn.wordpress.org/trunk@32302 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2015-05-01 16:38:29 +00:00

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