Bug 153038 NPE when delete master page content in old report design.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/ListEditPart.java
{
			getListHandleAdapt( ).removeGroup( group );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
		}
	}
	/**
	 * Check if inlucde header/footer
	 * 
	 * @param bool
	 * @param id
	 */
	public void includeSlotHandle( boolean bool, int id )
	{
		Object model = getListHandleAdapt( ).getChild( id );
		ListBandEditPart part = (ListBandEditPart) getViewer( )
				.getEditPartRegistry( ).get( model );
		if ( part == null )
		{
			return;
		}
		part.setRenderVisile( bool );
	}
	/**
	 * Check if inlucde header/footer
	 * 
	 * @param id
	 */