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/util/DataAdapterFactory.java
{
	/**
	 * The cached model package.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	protected static DataPackage modelPackage;
	/**
	 * Creates an instance of the adapter factory.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public DataAdapterFactory( )
	{
		if ( modelPackage == null )
		{
			modelPackage = DataPackage.eINSTANCE;
		}
	}
	/**
	 * Returns whether this factory is applicable for the type of the object.
	 * <!-- begin-user-doc --> This
	 * implementation returns <code>true</code> if the object is either the model's package or is an instance object
	 * of the model. <!-- end-user-doc -->