This is how I did it for the dataset I was using. It seems convoluted and stupid, but it was the only alternative to learning how to use the VB solution mentioned above.
q
since it wasn't anywhere on my data sheet.q
with nothing. This three step process turned all of the "empty" cells into "blank" cells". I tried merging steps 2 & 3 by simply replacing the blank cell with a blank cell, but that didn't work--I had to replace the blank cell with some kind of actual text, then replace that text with a blank cell.