Bug 213680 [2.2.2]Chart script can not be cleaned completely.
Description: Reset script or delete all script does not work. build version: v20071221-0630 steps to reproduce: 1. New a report. 2. New a chart. 3. Enter some script for the chart and save the report. 4. Click the reset scirpt button or delete all script. 5. Save the report and switch to layout,then switch back to script page. Expected result: Script are cleaned. Actual result: Script are not cleaned. Note: If you delete part of the script, it works.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/elements/ExtendedItem.java
/**
	 * Returns if this extended item has local property values on own model.
	 * 
	 * @return <code>true</code> if this extended item has local property
	 *         values on own model, <code>false</code> otherwise.
	 */
	public boolean hasLocalPropertyValuesOnOwnModel( )
	{
		return provider.hasLocalPropertyValuesOnOwnModel( );
	}
	/**
	 * Returns the predefined styles that are provided by the
	 * ExtendedItem.reportItem.
	 * 
	 * @param module
	 *            the root of the extended item
	 * @return a list containing predefined selectors in string
	 */
	public List getReportItemDefinedSelectors( Module module )
	{
		IReportItem reportItem = getExtendedElement( );
		try
		{
			if ( reportItem == null )
			{
				initializeReportItem( module );
				reportItem = getExtendedElement( );
			}
		}
		catch ( ExtendedElementException e )