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
* <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public EReference getTrigger_Action( )
	{
		return (EReference) triggerEClass.getEStructuralFeatures( ).get( 1 );
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public EAttribute getTrigger_TriggerFlow( )
	{
		return (EAttribute) triggerEClass.getEStructuralFeatures( ).get( 2 );
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public EDataType getData( )
	{
		return dataEDataType;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public DataFactory getDataFactory( )