Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLTableLayoutEmitter.java
{
			return cell;
		}
		public boolean isEmpty( )
		{
			return buffer == null || buffer.isEmpty( );
		}
		public void reset( )
		{
			buffer = null;
		}
	}
	
	public void flush( )
	{
		if ( hasDropCell( ) )
		{
			return;
		}
		Iterator iter = layoutEvents.iterator( );
		while ( iter.hasNext( ) )
		{
			LayoutEvent event = (LayoutEvent) iter.next( );
			switch ( event.eventType )
			{
				case LayoutEvent.START_GROUP :
				case LayoutEvent.START_BAND :
					ContentEmitterUtil.startContent( (IContent) event.value,
							emitter );
					break;