Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
{
			iter = current.propValues.keySet( ).iterator( );
			while ( iter.hasNext( ) )
			{
				String key = (String) iter.next( );
				if ( element.propValues.get( key ) != null )
					continue;
				PropertyDefn propDefn = getPropertyDefn( key );
				Object value = current.propValues.get( key );
				element.propValues.put( key, ModelUtil.copyValue( propDefn,
						value ) );
			}
			current = current.isVirtualElement( )
					? current.getVirtualParent( )
					: current.getExtendsElement( );
		}
		
		if ( element.propValues.get( DesignElement.DISPLAY_NAME_PROP ) != null )
		{
			element.propValues.remove( DesignElement.DISPLAY_NAME_PROP );
		}
		
		if ( element.propValues.get( DesignElement.DISPLAY_NAME_ID_PROP ) != null )
		{
			element.propValues.remove( DesignElement.DISPLAY_NAME_ID_PROP );
		}
		return element;
	}
	/**
	 * Returns the validation error list, each of which is the instance of