Sergey Biryukov 5188ab0ce7 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.
Merges [49166] to the 5.5 branch.
Fixes #51400.
Built from https://develop.svn.wordpress.org/branches/5.5@49167


git-svn-id: http://core.svn.wordpress.org/branches/5.5@48929 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-15 23:31:07 +00:00
..