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
set( Calendar.DATE, 1 );
			set( Calendar.MONTH, 0 );
		}
		else if ( iUnit == MONTH )
		{
			set( Calendar.MILLISECOND, 0 );
			set( Calendar.SECOND, 0 );
			set( Calendar.MINUTE, 0 );
			set( Calendar.HOUR, 0 );
			set( Calendar.DATE, 1 );
		}
		else if ( iUnit == DATE )
		{
			set( Calendar.MILLISECOND, 0 );
			set( Calendar.SECOND, 0 );
			set( Calendar.MINUTE, 0 );
			set( Calendar.HOUR, 0 );
		}
		else if ( iUnit == HOUR )
		{
			set( Calendar.MILLISECOND, 0 );
			set( Calendar.SECOND, 0 );
			set( Calendar.MINUTE, 0 );
		}
		else if ( iUnit == MINUTE )
		{
			set( Calendar.MILLISECOND, 0 );
			set( Calendar.SECOND, 0 );
		}
	}