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/DataFactoryImpl.java
return (Object) super.createFromString( eDataType, initialValue );
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public String convertDataToString( EDataType eDataType, Object instanceValue )
	{
		return super.convertToString( eDataType, instanceValue );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public DataPackage getDataPackage( )
	{
		return (DataPackage) getEPackage( );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @deprecated
	 * @generated
	 */
	public static DataPackage getPackage( )
	{
		return DataPackage.eINSTANCE;
	}
}