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
{
		IReportExecutor executor;
		public ReportStackingExecutor( IReportExecutor executor )
		{
			this.executor = executor;
		}
		public void close( )
		{
			executor.close( );
		}
		public IContent execute( )
		{
			return null;
		}
		public IReportItemExecutor getNextChild( )
		{
			return executor.getNextChild( );
		}
		public boolean hasNextChild( )
		{
			return executor.hasNextChild( );
		}
	}
	protected boolean checkAvailableSpace( )
	{