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 d
	 *            A previously defined Date instance
	 */
	public CDateTime( Date d )
	{
		super( );
		setTime( d );
	}
	/**
	 * A constructor that creates an instance from a given <code>Calendar</code>
	 * value
	 * 
	 * @param c
	 *            A previously defined Calendar instance
	 */
	public CDateTime( Calendar c )
	{
		super( );
		setTime( c.getTime( ) );
	}
	/**
	 * A constructor that creates an instance from a given <code>long</code>
	 * value
	 * 
	 * @param lTimeInMillis
	 *            The time defined in milliseconds
	 */
	public CDateTime( long lTimeInMillis )
	{
		super( );