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
/**
	 * A constructor that creates a default instance for a given locale
	 * 
	 * @param locale
	 *            The locale for which the instance is being created
	 * @deprecated use {@link #CDateTime(ULocale)} instead.
	 */
	public CDateTime( Locale aLocale )
	{
		super( aLocale );
	}
	/**
	 * A constructor that creates a default instance for a given locale
	 * 
	 * @param locale
	 *            The locale for which the instance is being created
	 * @since 2.1
	 */
	public CDateTime( ULocale locale )
	{
		super( locale );
	}
	/**
	 * A constructor that creates a default instance for a given timezone
	 * 
	 * @param tz
	 *            The timezone for which the instance is being created
	 */
	public CDateTime( TimeZone tz )
	{