Ok, I have solved this out of code and still using the Wix gallery pro.
I used the two dataset approach included (some way down) in:
And then created a new collection ‘DisplayDishes’ which only includes those dishes with an image. The filter in the Collections dataset then as an INCLUDE filter on a MANUAL ENTRY value of ‘DisplayDishes’.
This worked for me for now, though it would be useful to know howto do in code too…
Thanks again. Ratty