I usually use the web search field to look for one particular entry and typically get 10 to 30 entries back for my search terms. What I always do if there’s more than one result is to “deselect all” entries and scan the list for the right one (by ordering and looking at the details).
Now, when I’ve found the entry I was looking for, I select it and click OK … and wonder why it does not appear in my list. The reason is that no entry was checked and all checked entries, that is, none, have been successfully imported. I suggest to modify this dialog to import the selected entry if OK is clicked (and not cancel or X) with no checked entry. It seems much more natural to me.