Fallback for accordion slider – no entry in portfolio category

Hi enfold-team,

my client is offering refurbished instruments for sale.
I want to display these instruments as portfolio entries of their own category with an accordion slider.
This is working beautifully so far.
But once the instrument is sold, the entry gets deleted or set to private. So if there is no more entry in this category for a while, the accodion slider obviously does not appear.

My question is:
Is there a way to put fallback content (e.g. notification element saying “no offers at the moment”) when there are no entries in the respective category?
I am looking for a more elegant way than inserting content through javascript if the id of the accodion slider isn’t found.

Thanks in advance for your help!

Cheers,
Christoph

P.S.: I guess this might be of interest too for anybody trying to achieve a similar thing with standard post entries in a blog, masonry, magazine, … element.