Helen Hou-Sandí 4182df24f8 List tables: Even more robust fallback for the primary column.
Since `WP_List_Table::get_default_primary_column()` can be overridden in a subclass and columns can be further filtered, it is possible to end up with a primary column that no longer exists. This is particularly evident in list tables for custom post types that have been altered via filter.

props ocean90.
fixes #32996.

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