Sergey Biryukov 2b539c3a91 Login and Registration: Set a better default value for $wp_error parameter in login_header().
To prevent someone from passing a string (which would not be added to a new `WP_Error` instance), check for `is_wp_error()` explicitly.

Props desrosj, chetan200891, spyderbytes, lbenicio, sebastien@thivinfo.com, abdullahramzan.
Fixes #44052.

git-svn-id: https://develop.svn.wordpress.org/trunk@43457 602fd350-edb4-49c9-b593-d223f7449a82
2018-07-16 14:09:22 +00:00
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