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
}
						}
					}
				}
			}
		}
		if ( usedResolvedRow )
		{
			unresolvedRow = null;
		}
		updateRowHeight( rowArea, height, isFixedLayout );
	}
	
	private CellArea createEmptyCell( CellArea upperCell,
			int columnId, RowArea row, RowArea lastRow )
	{
		ICellContent cellContent = null;
		int rowSpan = 1;
		if ( upperCell != null )
		{
			cellContent = (ICellContent) upperCell.getContent( );
			rowSpan = upperCell.getRowSpan( ) - 1;
		}
		
		if ( cellContent == null )
		{
			cellContent = tableContent.getReportContent( )
					.createCellContent( );
			cellContent.setColumn( columnId );
			cellContent.setColSpan( 1 );