Check if mapping group exists in original image before attempting to copy (#5089)

          trackingLabel->findObject("IsisCube").addGroup(bandBin);

          // Write the mapping group to the tracking cube label

          if (inLab->findObject("IsisCube").hasGroup("Mapping")) {

            PvlGroup & mappingGroup = inLab->findGroup("Mapping", Pvl::Traverse);

            trackingLabel->findObject("IsisCube").addGroup(mappingGroup);

          }

          // Initialize an empty TrackingTable object to manage tracking table in tracking cube

          trackingTable = new TrackingTable();