Check for null values in string, if no values, print blank

Hi 

I posted a question a few days back, after playing with functions I was able to resolve it, I just have one more problem, if the string comes empty, only blank spaces should be printed, following is my string and my fix: 

My string: 

SEV.ORI/999999.VIN/1D7Hx11111111111111.VYR/2005.VMA/DODG.VMO/THU.DOT/07072013.CRT/MI1111111.OCA/11111111890123000001.LIT/PC.LIC/BFK9331

=Left(Split(Fields!MESSAGE.Value,"/")(6),2) + "/" 
& Mid(Split(Fields!MESSAGE.Value, "/")(6) ,3 ,2) + "/" 
& Mid(Split(Fields!MESSAGE.Value, "/")(6), 5, 4)

With this I get: 07/07/2013

If DOT comes empty, i get .CRT/

So I need to validate for empty space on DOT and print blank spaces. I'm guessing it would be with an IIF or IsNothing function. Any help would be appreciated.