Bug 151202 [regression]Set default master page to item in cell will cause blank page
Description: Set default master page to item in cell will cause blank page Steps to reproduce: 1. New a report 2. Insert a grid(1*1) 3. Insert a label to grid cell 4. Select the label and set default master page to it 5. Preview in Web Viewer and pdf Expected result: No blank page, just one page for grid display. Actual result: A blank page before grid page
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFAbstractLM.java
protected boolean handleVisibility( )
	{
		if ( isHidden( ) )
		{
			traverse( executor );
			return true;
		}
		else
		{
			return false;
		}
	}
	protected void traverse( IReportItemExecutor executor )
	{
		if ( executor != null )
		{
			while ( executor.hasNextChild( ) )
			{
				IReportItemExecutor child = (IReportItemExecutor) executor
						.getNextChild( );
				if ( child != null )
				{
					child.execute( );
					traverse( child );
					child.close( );
				}
			}
		}
	}
	protected abstract void cancelChildren( );