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
* <!-- end-user-doc -->
	 * @generated
	 */
	public static DataFactory init( )
	{
		try
		{
			DataFactory theDataFactory = (DataFactory) EPackage.Registry.INSTANCE.getEFactory( "http://www.birt.eclipse.org/ChartModelData" );  
			if ( theDataFactory != null )
			{
				return theDataFactory;
			}
		}
		catch ( Exception exception )
		{
			EcorePlugin.INSTANCE.log( exception );
		}
		return new DataFactoryImpl( );
	}
	/**
	 * Creates an instance of the factory.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public DataFactoryImpl( )
	{
		super( );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->