Boone Gorges 1045482f57 Improve handling for WP_Error objects in get_the_terms().
`wp_get_object_terms()` can return a `WP_Error` object. As such, the
`get_the_terms()` cache wrapper should handle them properly. To wit:

* Don't try to map an error object to `get_term()`. Introduced in [35032].
* Don't cache an error object as taxonomy relationships. Introduced in at least [16487], maybe earlier.

Ports [35850] to the 4.4 branch.

Props stephenharris.
Fixes #34723.


git-svn-id: https://develop.svn.wordpress.org/branches/4.4@35851 602fd350-edb4-49c9-b593-d223f7449a82
2015-12-10 03:43:50 +00:00
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