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/html/HTMLAbstractLM.java
{
		assert executor != null;
		assert content != null;
		while ( executor.hasNextChild( ) )
		{
			IReportItemExecutor childExecutor = executor.getNextChild( );
			if ( childExecutor != null )
			{
				IContent childContent = childExecutor.execute( );
				if ( childContent != null )
				{
					if ( !content.getChildren( ).contains( childContent ) )
					{
						content.getChildren( ).add( childContent );
					}
				}
				execute( childContent, childExecutor );
				childExecutor.close( );
			}
		}
	}
	public void close( )
	{
	}
	public void cancel( )
	{
		status = STATUS_END;
	}
}