Boone Gorges 72e14046c7 Improve querying for terms with falsey names and slugs. ...

Prior to [38677], `get_term_by()` would always return false if
an empty string were passed as the queried 'name' or 'slug'. The
refactor to use `get_terms()` broke this behavior; inappropriately
imprecise `empty()` checks caused the 'name' or 'slug' clause to be
discarded altogether when fetching terms, resulting in an incorrect
term being returned from the function.

We fix the regression by special-casing truly empty values passed
to `get_term_by()`, and ensuring that `WP_Term_Query` is properly
able to handle `0` and `'0'` term queries.

Props sstoqnov.
Fixes #21760.
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git-svn-id: http://core.svn.wordpress.org/trunk@40200 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2017-03-16 02:04:43 +00:00

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