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
* @return the meta object for class '<em>Sample Data</em>'.
	 * @see org.eclipse.birt.chart.model.data.SampleData
	 * @generated
	 */
	EClass getSampleData( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.data.SampleData#getBaseSampleData <em>Base Sample Data</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference list '<em>Base Sample Data</em>'.
	 * @see org.eclipse.birt.chart.model.data.SampleData#getBaseSampleData()
	 * @see #getSampleData()
	 * @generated
	 */
	EReference getSampleData_BaseSampleData( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.data.SampleData#getOrthogonalSampleData <em>Orthogonal Sample Data</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @return the meta object for the containment reference list '<em>Orthogonal Sample Data</em>'.
	 * @see org.eclipse.birt.chart.model.data.SampleData#getOrthogonalSampleData()
	 * @see #getSampleData()
	 * @generated
	 */
	EReference getSampleData_OrthogonalSampleData( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.data.SampleData#getAncillarySampleData <em>Ancillary Sample Data</em>}'.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return the meta object for the containment reference list '<em>Ancillary Sample Data</em>'.
	 * @see org.eclipse.birt.chart.model.data.SampleData#getAncillarySampleData()
	 * @see #getSampleData()