code: private static void addDataSerieValue(final DataSeries dataSeries, final Entry entry,
  			final int value) {
  		if (entry.getKey() != null && value > 0) {
  			dataSeries.add(FIRST_OF_JAN + entry.getKey(), value);
  		}
  	}
docs: Adds the data serie value.
  
  @param dataSeries the data series
  @param entry      the entry
  @param value      the value