How to handle "No such tuple" in MDX query ?

[Exie]

Hi,

I have a report I'm making which passes a parameter into an MDX query. It's a sales report, and when I use one sales rep, it works cool, but when I use a new sales rep who doesnt have any sales for last month, I get:Error filling print... No such tuple ([Measures].[Prior MTD Sales] on axis 0.

The measure is defined as: 

member [Measures].[Prior MTD Sales]  as='Sum(Mtd(ParallelPeriod([Time].[Year], 1.0, $P!{FullDateSelection} )), [Measures].[Total Value])', format_string = "|$#,###.00|"

I know there will be no data for the particular rep, can I just get it to return blank or null or something rather than erroring out ?