Well, I suppose conditional formatting using ISNA would provide an
alternative route to hide the ugly #N/As ..
Select the formulas col (assume this is in col A)
Then click Format > Conditional Formatting, and make the settings as:
Condition 1, Formula is: =ISNA(A1)
Format the font as white (to mask) > OK out
Note that the underlying values masked are still #N/A, though ..
You could use conditional formatting to hide them. They'll still be there,
you just won't be able to see them but if these results are used in other
calculations this could be a problem.
To use conditional formatting:
Select the range of cells in question. Assume this is A1:A10
Goto the menu Format>Conditional Formatting
Formula Is: =ISNA(A1)
Set the font color to be the same as the fill color
OK out