There is a 'cunning plan' that works with Logit's formula solution. Namely, if you reverse columns A and B so that the data is in column B and the formula is in column A, the text "Not Available" produced by the formula in column A will overflow into the blank cell of column B. By reducing column A to 8pts and indenting the alignment by 1, the text will appear to be in the data column B.
Of course, if you reference the data, you have to remember that the cell in column B is blank, otherwise you could finish up looking somewhat foolish!