a date from date w/exception of when empty - SOLVED

[teachesms]

What I want is: "Days Past Delivery Date" column to track how many days the "Act Comp Date" is past the "Req Comp Date", and am using the formula: =IF(F2<E2,E2-F2,"") in the example I am sending in cell G2. However, when there is no date in column F to do the calculation on, I want nothing to show up as the answer in column G. I remember using an NA function, but forget how to place it. Could you help?

Thanks,
(see example pic)

Think I fixed it...

=IF(F2<>"",E2-F2,"")