My recommendation would be to use row visibility to hide rows where the corresponding field is empty or missing. I don't know whether your data has "" or NULL behind the scenes so this is generic advice.
Here is a great set of examples of the types of formulae you can use: http://msdn.microsoft.com/en-us/library/ms157328.aspx
If the field is NULL you can use the is nothing
evaluator like
=(Fields!Sales.Value is NOTHING)
to return a TRUE or FALSE, alternatively you can do a check of the string length using the function LEN()
to see how long it is and if it is 0, hide the row.