Bug 197454 Export report as PDF and Postscript does not work correctly [1200]
Description: Export report as PDF and Postscript does not work correctly. Build number: 2.2.1.v20070719-0630 Steps to reproduce: 1. New a report with a label, set its visibility to "hide in html". 2. Preview in Web Viewer, click "Export Report" button, select format as "PDF" or "Postscript". 3. Click "Print as PDF" button. Expected result: The label is shown. Actual result: The label disappears. Error log: N/A
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLAbstractLM.java
* @param executor
	 */
	private void traverse( IReportItemExecutor executor )
	{
		assert executor != null;
		while ( executor.hasNextChild( ) )
		{
			IReportItemExecutor child = (IReportItemExecutor) executor
					.getNextChild( );
			if ( child != null )
			{
				child.execute( );
				traverse( child );
				child.close( );
			}
		}
	}
	/**
	 * execute the report and add all its contents into the content.
	 * 
	 * @param content
	 * @param executor
	 */
	protected void execute( IContent content, IReportItemExecutor executor )
	{
		assert executor != null;
		assert content != null;
		while ( executor.hasNextChild( ) )
		{
			IReportItemExecutor childExecutor = executor.getNextChild( );