In the Crystal Reports designer, look at the properties of your section and there should be a Suppress option that you can give it a formula to return the appropriate boolean value.
Then you can use the Count () function inside this formula and (I suppose) you can pass the name of your dataset to the Count () function to get the number of rows in that dataset.
I did the same in a complex report about 3 months ago, but I don’t have access to a report that has already changed tasks, so I regret that I can not be more specific, but gladly it gives you a starting point.
Just had a quick google - try this .