sql - Error in stored procedure Null value is eliminated by an aggregate or other SET operation -

i m trying following query execute gives me warning null value eliminated aggregate or other set operation.

select    s.currentdate,   s.game_id,   s.searchstring,   sm.type_of_game,   case when(count(t.game_id)>0) 'y' else 'n' end scorestatus,   case when(count(i.game_id)>0) 'y' else 'n' end scorestatusindividual,   sm.image_path,g.datetime,'' score_keeper dbo.search s  with(nolock)  left outer join dbo.teamgameresult t  with(nolock) on s.game_id = t.game_id left outer join dbo.individualgameresult  with(nolock) on i.game_id = s.game_id  join dbo.game g  with(nolock) on g.game_id=s.game_id  join  dbo.additionaldetails ad on ad.additionaldetails_id = g.additionaldetails_id join dbo.sportmaster sm  with(nolock) on  sm.sportsmaster_id = ad.sportsmaster_id (( searchstring+' '+ convert(nvarchar(500),s.currentdate,101) '%01/15/2013%'    , searchstring+' '+ convert(nvarchar(500),s.currentdate,101) '%soccer%'))   , convert(varchar(10),g.datetime,101) in ('01/15/2013','01/14/2013') group s.game_id,          s.searchstring,          sm.type_of_game,          s.currentdate,          sm.image_path,          g.datetime order g.datetime desc  

it warns because using

... when(count(i.game_id)>0) 'y' else 'n' end ... 

count aggregate function , can't counts values game_id null. may use isnull function (http://msdn.microsoft.com/en-gb/library/ms184325.aspx) example:

count(isnull(i.game_id, 0)) 

but calculates null values too. if not want need add additional check section