Question Bank: item table disappears after searching with non-existing word

view http://screencast.com/t/kwZXX3LNa3 to see what happens

when searching the item table in e.g. "My questions" with a word that does not exist in the table, the whole table disappears, including the search form. This should not happen. Best would probably be to show a notification such as "No search results found" and display the full table.