Tech Support: cubemember/cubevalue parameter values (e.g. wildcard) that will be ignored or have no effect on calculation?

cubemember/cubevalue parameter values (e.g. wildcard) that will be ignored or have no effect on calculation?

My final cell to pull a cube value is:
=CUBEVALUE("ICCC",$B$2,$D8,$C8,E$2)
There may be situations in which one of these parameters would be left blank by a user, and the intent would be to return the slice of the cube without that extra 'filter'.
D8 = CUBEMEMBER("ICCC","[SPF].[SPF].&[" & B8&"]")
but when B8 is left blank, the cubevalue returns NA/# values
So I tried:
D8 = IF(B8="","",CUBEMEMBER("ICCC","[SPF].[SPF].&[" & B8&"]"))
but it is still trying to pull in the blank value and the final cubevalue returns an error.
Is there a way to pass a blank or wildcard value to the cubevalue and allow calculation, or do I need to come up with some embedded 'IF' statements on the Cubevalue to check whether every source cell has a value before calculating the Cubevalue itself?
Thanks!
Keith

Anwsers to the Problem cubemember/cubevalue parameter values (e.g. wildcard) that will be ignored or have no effect on calculation?

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That got me thinking about how to deal with the error, and was helpful in guiding my thinking.
 
I finally figured out a solution (which might be transparent to someone who uses this stuff all the time, but this is my first project using the CUBE functions).
Posting here to help others who search for answers in the future.
 
I used data validation against a named range to allow the user to select an item (list was originally pulled from the source database, and at the moment will have to be refreshed manually).
For example, the data validation might be in cell A4
I then used CUBEMEMBER formulas to pull the exact same value, but in a format the CUBEVALUE formula will find acceptable- this was in cell B4:
=CUBEMEMBER("ICER","[CurrentInvr].[PackageType].&["&A4&"]")
As per my original post, I then used CUBEVALUE against multiple criteria cells like B4.
To resolve my "wildcard" issue, I added the value ALL to the top of my named range for data validation.
Instead of leaving those cells blank, if ALL is selected, then CUBEMEMBER returns the value of ALL and that particular selection has no impact on the
overall results pulled from the other selected values.

Thanks to Pollardie and ediardp for taking the time to suggest solutions.
Keith

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