Shape map

I add a shape map visual to my dashboard. The dataset I have contains two columns: name of area and name of activities taking place in it (the relation between the shape and my data set is one to many). There are areas on the shape that are not listed at all in my dataset (as there is no activates taking place in it). I added a table visual that lists the activities of a particular area when I click the area’s respective polygon on the shape. Everything is ok expect when I click of a polygon of an areas with no activities (its name is missing from my dataset). Instead of displaying nothing in such a case, the full list of activities is displayed. Can you help me on this?