I'm not sure how to explain this but I'll try.
I have a web part that displays a list of categories. The Category list is connected to another web part that displays all documents in that category. That second list is called "Emails". The Emails list is connected to a third web part called "Details" that displays the detail of the list item selected from the second list.
The problem comes when I click on a category that doesn't have any "emails" associated with it. The "Details" list will continue to display the last item that had content. Everything works great if the Emails list has at least one entry but if there are Zero entries in the Emails list, the Details doesn't clear. Any idea on how to do this?