Thank you for your help,
I was able to get it to work as follows.
Since Crystal returns a value of 12/30/1899 for a blank date I had to Create a formula field. Name it blank.
IF {EXPDATE} = Date(1899,12,30) then Date(0,0,0) else {EXDATE}.
Then in the select Expert enter, BLANK is equal to 0/0/0
This returned only Employees with a Blank Expiration date for the benefits