Bug 161219 Gantt chart with null datapoints fail to render
Create a dataset with two date columns, having some null date values Create a gantt chart Assign the dates to the gant series It fails to render and throw exception. Expected: null dates should be treated as: - 1 null date, 1 valid date ->one marker drawn, no line - 2 null dates -> skip rendering of datapoint If the decoration label is missing it should also not fail.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/util/CDateTime.java
* @param minute
	 *            The minute (0-59) of the hour associated with this instance
	 */
	public CDateTime( int year, int month, int date, int hour, int minute )
	{
		super( year, month - 1, date, hour, minute );
	}
	/**
	 * A constructor that creates an instance for a specified year, month, date,
	 * hour and minute
	 * 
	 * @param year
	 *            The year associated with this instance
	 * @param month
	 *            The month index (1-12) of the year (1-based)
	 * @param date
	 *            The day of the month associated with this instance
	 * @param hour
	 *            The hour (0-23) of the day (military) associated with this
	 *            instance
	 * @param minute
	 *            The minute (0-59) of the hour associated with this instance
	 * @param second
	 *            The second (0-59) of the minute associated with this instance
	 */
	public CDateTime( int year, int month, int date, int hour, int minute,
			int second )
	{
		super( year, month - 1, date, hour, minute, second );
	}