Live search should indicate when there are no results

When entering text in the search box on the main page, if there are no matching records, the row simply shows blank. It would be nice if it returned a result like [No Results] to let the user know it's not still thinking.

For example, in our Wiki we have several documents which contain references to SQL Server. If I start my search with SQL I can clearly see matches. If however I keep going and add SQLSSS, then I wouldn't expect any matches to be displayed. Instead the search result window appears blank with the link on the far right side saying "Show All Results". It would be nice if the line changed to illustrate there aren't any matches to be clear to the user that no results were found.