[wp-hackers] Get non empty taxonomy terms, restricted by post type.

[Tom Barrett]

If I have a taxonomy spanning multiple post types (specifically, I have
added core categories to a 'books' product type), how do I find all the non
empty category terms for 'books'. I.e. exclude category terms that are used
posts, pages e.t.c.?

I can't see any arguments or filter hooks where I can change the behaviour
of wp_dropdown_categories() or get_terms().

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