I don't know if there is anything built in. You can roll your own with
error trapping:


something like that is what I was planning to do after seeing Ton's post,
but now that I look at it again, I see that I don't even need to do that.

The loop I have that populates the array by checking the columns, has two
variables, i and j .. i for the columns, and j for the columns that meet the
condition to be added to the array.

j is incremented in the interior of the loop, and if j never gets
incremented, then the array was never populated.

so it turns out that all I have to do is check whether j is still 0.

Thanks.