Sergey Biryukov df51aa9b6f Upgrade/Install: Check if plugin or theme update results are available before applying the notification filters.
This avoids a PHP notice for an undefined index of either `plugin` or `theme` in the `auto_{plugin|theme}_update_send_email` filter hook.

Props afragen, audrasjb.
Fixes #51400.
Built from https://develop.svn.wordpress.org/trunk@49166


git-svn-id: http://core.svn.wordpress.org/trunk@48928 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-15 23:27:03 +00:00
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2017-11-30 23:11:00 +00:00