MySQL - query to return NULL
===

I have the following code:

    SELECT q25, (
    (
    AVG( q1 ) + AVG( q2 ) + AVG( q3 ) ) /3 ) AS Overall
    FROM t_results
    WHERE brand =  'XYZ'
    AND DATE =  'MAY2012'
    GROUP BY q25
    ORDER BY Overall 
    DESC LIMIT 1

If there is no data found by the query phpmyadmin returns the following message (which is quite correct):

    MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0178 sec )

However, what I'd like is to actually return a `NULL` value, is this possible?  I appreciate this might not be best practise but I'm working with inherited code and this might be the simplist and quickest route to a solution.

Thanks as always,

H.
