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/DataPackage.java
* @see org.eclipse.birt.chart.model.data.impl.DataPackageImpl#getDateTimeDataElement()
	 * @generated
	 */
	int DATE_TIME_DATA_ELEMENT = 5;
	/**
	 * The feature id for the '<em><b>Value</b></em>' attribute. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @generated
	 * @ordered
	 */
	int DATE_TIME_DATA_ELEMENT__VALUE = DATA_ELEMENT_FEATURE_COUNT + 0;
	/**
	 * The number of structural features of the '<em>Date Time Data Element</em>' class.
	 * <!-- begin-user-doc --> <!--
	 * end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int DATE_TIME_DATA_ELEMENT_FEATURE_COUNT = DATA_ELEMENT_FEATURE_COUNT + 1;
	/**
	 * The meta object id for the '{@link org.eclipse.birt.chart.model.data.impl.DateTimeDataSetImpl <em>Date Time Data Set</em>}' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.data.impl.DateTimeDataSetImpl
	 * @see org.eclipse.birt.chart.model.data.impl.DataPackageImpl#getDateTimeDataSet()
	 * @generated
	 */
	int DATE_TIME_DATA_SET = 6;
	/**
	 * The feature id for the '<em><b>Values</b></em>' attribute. <!--