Bug 168148 [regression]Table with chart from library fails to preview.[01][0001]
Description: Table with chart from library fails to preview. Build number:2.1.2.v20061215 and 2.2.0.v20061213 Steps to reproduce: 1.Create a library, create a sample DB data source and data set: select * from orders 2.Insert a tabel to the library, bind data set to the table 3.Insert a group for the tabel ,group by "row["OrderDate"]", Interval: Year, Range:1 4.Drag a chart into 3rd cell on group row, bar chart, go to "Select Data" tab , bind data set, X Series:row["OrderDate"], Y Series:row["OrderNumger"]; click "Finish" button 5.Create a new report, use the library 6.Drag the table in the library to the report. 7.Preview in html. Expected Result: Report content displays without errors. Actual result: Error happened while running the report.(same for 2.1.2 and 2.2.0) Error log: org.eclipse.birt.report.service.api.ReportServiceException: Error happened while running the report
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/extension/PeerExtensibilityProvider.java
}
	/**
	 * Gets the list of style masks for Model style properties.
	 * 
	 * @return the list of the style masks
	 */
	protected List getStyleMasks( )
	{
		return Collections.EMPTY_LIST;
	}
	/**
	 * Returns the value of extension property or extension model property.
	 * 
	 * @param propName
	 *            name of the property
	 * @return the value of the given property. If the property is not found, or
	 *         the value is not set, return null.
	 */
	public Object getExtensionProperty( String propName )
	{
		if ( isExtensionXMLProperty( propName ) && hasOwnModel( propName ) )
		{
			if ( reportItem != null )
			{
				ByteArrayOutputStream stream = reportItem.serialize( propName );
				if ( stream == null )
					return null;
				String retValue = null;
				try
				{