title: Displaying static text instead of empty group in JasperReports
body: <p>I have a Jasper report that displays a list of bill line items. These items are grouped by billing period, and then by whether the item is a charge or credit. For billing periods in which there are charges but no credits, I would like to display a static text field stating "No credits" in the Credit group for that period. How can this be done? </p>
  
  <p>Edited to add: This is assuming that I am using an SQL query for the data source, as opposed to customizing one. If I customize my data source, I can handle this in pre-processing before I reach the report, but I was hoping to discover a way to get around Jasper's behavior of skipping groups with no rows meeting the group criteria. </p>