Can you really use Display String formula to test for NULL

I am trying to manipulate the Display String of a field throught the Format Editor.  If a field is null, it should display "N/A", or "No data given", or anything else appropriate I might choose.
I can't get this feature to work and I'm wondering if there's a bug here.  I'm using the following formula:
if (isnull() or    trim() = "")
then "N/A"
    else
Am I doing something wrong or is there a better way to do this?

Hi Adriane
The other way to display "N/A", or "No data given" if a field is null is using a formula with if -else statement as follows:
whileprinting records;
if (isnull() or trim () =" ")
then "N/A"
else
Please let me know if this helps.
Thanks
Poonam Thorat

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