WordPress/wp-includes
Peter Wilson 1ee362004f Upgrade: Prevent warnings upgrading cron array.
An unvisited site may have an undefined cron array, resulting in `_get_cron_array()` returning the value `false`. Previously this would trigger warning in `upgrade_590()` as the function assumed `_get_cron_array()` would alway return an array.

No database version change is required as the upgrade routine was successful on sites with a cron array during 5.9.0. On sites without a cron array, the error has already been thrown if they are running db version 51917. This fix is only required for new sites or those upgrading that have skipped 5.9.0.

Follow up to [51917].

Props chrisvanpatten, kapilpaul, SergeyBiryukov.
Fixes #54906.
See #53940.

Built from https://develop.svn.wordpress.org/trunk@52656


git-svn-id: http://core.svn.wordpress.org/trunk@52245 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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