Sergey Biryukov 253e1e0413 Code Modernization: Bring consistency to preparing some fields on Network Settings screen:
* `illegal_names`
* `limited_email_domains`
* `banned_email_domains`

If any of these options have a falsey value, treat it as an empty string. This addresses a PHP 8.1+ deprecation notice when passing a `null` value to `str_replace()`.

Additionally, avoid unnecessary type casting for better performance.

Props hellofromTonya, jrf, SergeyBiryukov.
See #51423.
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git-svn-id: http://core.svn.wordpress.org/trunk@50381 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-04-20 14:49:08 +00:00
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