Bug 202254 Exception is thrown when category values are null and type of X axis is set to DateTime
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/data/impl/DataPackageImpl.java
} );
		addAnnotation( getOrthogonalSampleData_SeriesDefinitionIndex( ),
				source,
				new String[]{
						"kind", "element", 
						"name", "SeriesDefinitionIndex" 
				} );
		addAnnotation( queryEClass, source, new String[]{
				"name", "Query", 
				"kind", "elementOnly" 
		} );
		addAnnotation( getQuery_Definition( ), source, new String[]{
				"kind", "element", 
				"name", "Definition" 
		} );
		addAnnotation( getQuery_Rules( ), source, new String[]{
				"kind", "element", 
				"name", "Rules" 
		} );
		addAnnotation( ruleEClass, source, new String[]{
				"name", "Rule", 
				"kind", "elementOnly" 
		} );
		addAnnotation( getRule_Type( ), source, new String[]{
				"kind", "element", 
				"name", "Type" 
		} );
		addAnnotation( getRule_Value( ), source, new String[]{
				"kind", "element", 
				"name", "Value"