Bug 204238 Right border of blank cell is not drawn when preview as XLS [1203]
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/layout/XlsTable.java
public XlsTable(TableInfo table, XlsContainer container)
	{
		this(table, container.getStyle( ), container.getRule( ));
	}
	
	public boolean isEmpty()
	{
		return false;
	}
	
	public Rule getColumnRule(int column, int span)
	{
		int sp = getRule().getStart( );
		
		for(int i = 0; i < column; i++)
		{
			sp += columns[i];
		}	
		
		int sw = 0;
		
		for(int i = column; i < column + span; i++)
		{
			sw += columns[i];
		}	
		
		return new Rule(sp, sw);
	}	
}