MDX query to get sales by product line for specific period plus number of months with sales?

Function Count(, ExcludeEmpty) counts number of non empty set members. So if we crossjoin Month with measure we will get set that we can use to count members.
Query example:
WITH Member [Measures].[Months With Non Zero Sales] AS
COUNT(CROSSJOIN([Measures].[Sales Amount]
, DESCENDANTS({[Date].[Calendar].[Calendar Year].&[2003]: [Date].[Calendar].[Calendar Year].&[2004]}, [Date].[Calendar].[Month]))
, ExcludeEmpty
)
SELECT {[Measures].[Sales Amount], [Measures].[Months With Non Zero Sales]} ON 0
, [Product].[Product Model Lines].[Product Line].Members on 1
FROM [Adventure Works]
WHERE ([Date].[Calendar].[Calendar Year].&[2003]: [Date].[Calendar].[Calendar Year].&[2004])