Sergey Biryukov 64a4066874 Upgrade/Install: Check if the theme installer skin's overwrite property exists in Theme_Upgrader::install_strings().
This ensures consistency with `Plugin_Upgrader::install_strings()` and resolves an issue caused by the property not existing in other upgrader implementations.

Props schlessera, azaozz.
See .
Built from https://develop.svn.wordpress.org/trunk@48493


git-svn-id: http://core.svn.wordpress.org/trunk@48255 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-07-16 13:19:03 +00:00
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