Ghost products on global store page

Hi,

I'm launching my website but have empty products on my global store. It looks pretty bad and unprofessional for a commercial website unfortunately :slight_frown:

It seems like they are test products or deleted products from subsites which may or may not still exist. Is there a way to get rid of these empty listings?
http://www.fitguana.com/global-store/

Thanks,

Sander