Filter out Row if Column is Empty

Ok, so I wanted to display the 'Order comments: Comment' [Ubercart].
However, this field gets updated a Couple times,
And even though the first entries are NULL I end up with this:

---Time----Order#---OrderStatus-----Price--------Comment---------
08/11/2016 45 Code Unavailable $0.00 <<<<<<<< When order is first placed, a NULL Comment is Added
08/11/2016 45 Code Unavailable $0.00 Rejected by Admin <<<<<<<< Order Complete, adds another comment.

How can I add a "Order comments: Comment { if 'Comment' isnot NULL; Display }" Filter?
Cause there is not a Filter for "Order comments: Comments"

Or if I can somehow do something like
if Order# is the same, Only display the Latest comment entry by time, or something.

Really need to get rid of these doubles.