Bug 315035 [Automation][Regression]Error happened while merge cells in grid when preview as pdf/ppt/ps
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/nLayout/area/impl/TableLayout.java
public void remove( TableArea table )
	{
		ArrayList rowCollection = new ArrayList( );
		add( table, rowCollection );
		Iterator iter = rows.iterator( );
		while ( iter.hasNext( ) )
		{
			RowArea row = (RowArea) iter.next( );
			if ( rowCollection.contains( row ) )
			{
				iter.remove( );
			}
		}
		rows.resetCursor( );
	}
	
	public void clear()
	{
		rows.clear( );
		rows.resetCursor( );
	}
	protected IStyle getLeftCellContentStyle( RowArea lastRow, CellArea currentCell )
	{
		RowArea currentRow = (RowArea) currentCell.getParent( );
		int columnID = currentCell.getColumnID( ); 
		CellArea cell = null;
		if ( isRTL )
		{
			cell = currentRow.getCell( columnID + 1 );
			if ( cell == null && lastRow != null )