code: def _descr_str(descr, data, region):
      
      if data:
          name = dd.get_sample_name(data)
          if name:
              descr = "{0} : {1}".format(descr, name)
          elif "work_bam" in data:
              descr = "{0} : {1}".format(descr, os.path.basename(data["work_bam"]))
      if region:
          descr = "{0} : {1}".format(descr, region)
      return descr
docs: Add additional useful information from data to description string.