We have used (Moodle 2.2.1+) the first name and surname search facility to search for users responses, as shown below.
When there are no users found using the search facility it disappears, as shown below.
The only way to get back to the previous page is to click on the (IE v9) browsers back button. Surely the search facility shouldn't disappear when no users have been found?
Cheers
Ali