The 'manage_posts_extra_tablenav' action does not fire for bottom tablenav when no posts exist

[fluxbe]

Currently, the manage_posts_extra_tablenav action is never fired for the bottom tablenav when there are no posts yet. This makes it impossible for plugins to render custom content (for example, a call-to-action block) in the bottom tablenav area on empty post list screens.

This behavior appears to have been introduced in 63369 (see 60613). It would be helpful if the manage_posts_extra_tablenav action fires for the bottom tablenav regardless of whether posts exists, so plugins can hook into that location, even on empty lists.