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
{
		return (EAttribute) ruleEClass.getEStructuralFeatures( ).get( 0 );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public EAttribute getRule_Value( )
	{
		return (EAttribute) ruleEClass.getEStructuralFeatures( ).get( 1 );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public EClass getSampleData( )
	{
		return sampleDataEClass;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public EReference getSampleData_BaseSampleData( )
	{
		return (EReference) sampleDataEClass.getEStructuralFeatures( ).get( 0 );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated