Scott Taylor 18827ed337 In wp_ajax_hidden_columns(), don't explode() on an empty string.
In `columns.hidden()`, which lives in `common.js`, don't return items with no `id`.

This was resulting in options like `manageedit-postcolumnshidden` containing a serialized array with random empty items.

Props afercia, wonderboymusic.
Fixes #32466.

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