Display default text for empty fields in a PopUp window

I'm using FlexViewer 2.5. I have a PopUp window for a Zoning layer. The PopUp displays the Zoning, Planned Development Number and an Amendment Number. Most parcels don't have a Planned Development Number or Amendment so when you click a parcel it displays "Planned Development:" and "Amendement:" This is confusing users into thinking every parcel is a Planned Development. So I need a way to either removes the "Planned Development:" text from the PopUp if it is not applicable or putting some type of default text like "N/A" on the PopUp. Any help is appreciated. Thanks.