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
* Copies the extension values and extension element instance, which
	 * implements <code>IReportItem</code>.
	 * 
	 * @param source
	 *            the source peer extensibility provider
	 */
	public void copyFrom( PeerExtensibilityProvider source )
	{
		
		reportItem = null;
		if ( source.reportItem != null )
		{
			reportItem = source.reportItem.copy( );
		}
		
		extensionPropValues = new HashMap( );
		Iterator it = source.extensionPropValues.keySet( ).iterator( );
		while ( it.hasNext( ) )
		{
			String propName = (String) it.next( );
			PropertyDefn propDefn = element.getPropertyDefn( propName );
			Object value = source.extensionPropValues.get( propName );
			Object valueToSet = ModelUtil.copyValue( propDefn, value );
			extensionPropValues.put( propName, valueToSet );
		}
	}
	/**
	 * Return the extension element, which implements the interface
	 * <code>IReportItem</code>.
	 *