Felix Arntz 1e4e60f11c Customize: Safeguard a check on the customize_validate_{$setting_id} filter value to ensure it is a WP_Error.
While the filter is documented to only support a `WP_Error`, it has been a common practice to return true in a validation function if no errors have occurred. This was already caught when the same filter was executed in `WP_Customize_Setting`, it was however missing in `WP_Customize_Manager::validate_setting_values()`.

Fixes #44809.


git-svn-id: https://develop.svn.wordpress.org/trunk@43578 602fd350-edb4-49c9-b593-d223f7449a82
2018-08-19 16:37:12 +00:00
2017-11-30 23:09:33 +00:00
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