In `wp_ajax_ajax_tag_search()`, bail immediately if `$_GET['tax']` isn't set so that all of the variable setting can happen in the same nest scope as the rest of the function - `wp_die()` confuses Scrutinizer.

See #30224.

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In `wp_ajax_get_tagcloud()`, bail immediately if `$_POST['tax']` isn't set so that all of the variable setting can happen in the same nest scope as the rest of the function - `wp_die()` confuses Scrutinizer.

See #30224.

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git-svn-id: http://core.svn.wordpress.org/trunk@30168 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix the return value doc for `WP_List_Table->get_pagination_arg()`.

See #30224.

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Declare the `$options` property for `WP_Upgrader_Skin`.

See #30224.

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Declare the `$update_count` and `$update_current` properties for `WP_Upgrader`.

See #30224.

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Declare the `$uploaded_headers` and `$default_headers` properties for `WP_Customize_Header_Image_Control`.

See #30224.

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In `_WP_Editors::editor_settings()`, `$str1` and `$str2` don't need to be initialized empty.

See #30224.

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Split tests for wp_get_sites()

Test various arguments for `wp_get_sites()` in a more intentful way rather than in one large test. Leave tests for limit and offset together for convenience.

See #30080

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Improve layout of test for cached invalid, then valid site details

* Rename method to `test_get_blog_details_when_site_does_not_exist()`.
* Always assume `MAX(blog_id)` is 1 and therefore always create a burner.
* Remove tests specific to `wpmu_delete_blog()` and cache, to be handled elsewhere.
* Remove extra asertions.

See #30080, #23405

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Delete admin_created_user_subject() rather than deprecate

As it was never used as anything more than a callback to a filter before the MU merge, and is only available in user-new.php in multisite, it is safe to remove this function entirely.

Fixes #29915

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Use common core syntax for checking DOING_AJAX

Our current check for a non truthy `DOING_AJAX` is `! DOING_AJAX`.

props TobiasBg
Fixes #29891

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