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
* 
	 * @generated
	 * @ordered
	 */
	int TRIGGER__CONDITION = 0;
	/**
	 * The feature id for the '<em><b>Action</b></em>' containment reference.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int TRIGGER__ACTION = 1;
	/**
	 * The feature id for the '<em><b>Trigger Flow</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int TRIGGER__TRIGGER_FLOW = 2;
	/**
	 * The number of structural features of the '<em>Trigger</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int TRIGGER_FEATURE_COUNT = 3;
	/**
	 * The meta object id for the '<em>Data</em>' data type.
	 * <!-- begin-user-doc -->