Cannot create query list of only the assigned taxonomies

Topics: Administration, Customizing Orchard
Sep 10, 2015 at 10:25 AM
I created a query of all taxonomies but I don't want to show them all only the ones which are not empty (assigned to at least one content).
The taxonomies doesn't even show up as properties of the query layout.
Do you know how can I do this?
Thanks!