Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/buffermgr/TableContentLayout.java
}
				if ( lastCell.status == Cell.CELL_USED )
				{
					if ( lastCell.rowId + lastCell.rowSpan >= rowCount + 1 )
					{
						lastCell.rowSpan--;
					}
				}
			}
		}
		return null;
		
	}
	/**
	 * create a cell in the current row.
	 * 
	 * if the cell content is not empty put it into the table if the cell is
	 * empty: if the cell has been used, drop the cell else, put it into the
	 * table.
	 * 
	 * @param cellId
	 *            column index of the cell.
	 * @param rowSpan
	 *            row span of the cell
	 * @param colSpan
	 *            col span of the cell
	 * @param content
	 *            cell content
	 */
	public void createCell( int cellId, int rowSpan, int colSpan,