Finding splits with blank amounts?

[Adam Funk]

It used to be quite easy to accidentally create foreign currency
transactions with no value (i.e., both Dr and Cr columns *blank* in
the GUI) in the other split items.  Now that the "edit exchange rate"
pops up automatically, this happens a lot less often, but I have come
across a few old ones like this.

Is it possible to use the "find" function to identify split entries
where both value columns are blank?