Can someone write a simple if statement for me?

If D2 is null then P2 is null else P2 =
VLOOKUP(D2,Comments!$A$2:$B$9999,2,FALSE)

I'm looking for something I can simply paste into formula builder. I
am refreshing data from a query, and don't know how many lines I'll
import. If the row is blank as I have it now - the cell has a #N/A in
it - so it causes printing problems. Or is there a better way to
accomplish this?


Thanks in advance.