src/org/tiefaces/components/websheet/configuration/ConfigurationHandler.java
private int verifyLastCell(final Row row, final int stoppoint, final int sheetRightCol) {

		int lastCol = sheetRightCol;
		int col;
		for (col = lastCol; col >= stoppoint; col--) {

			Cell cell = row.getCell(col);
			if ((cell != null) && (cell.getCellTypeEnum() != CellType.BLANK)) {
				break;
			}
		}
		return col;
	}
private int verifyLastCell(final Row row, final int stoppoint, final int sheetRightCol) {

		int lastCol = sheetRightCol;
		int col;
		for (col = lastCol; col >= stoppoint; col--) {

			Cell cell = row.getCell(col);
			if ((cell != null) && (cell.getCellTypeEnum() != CellType.BLANK)) {
				break;
			}
		}
		return col;
	}
check last column. if it's blank then treat it as null cell.

@param row
row object.
@param stoppoint
the left cell we want to stop check.
@param sheetRightCol
the sheet right col
@return integer. the last column without blank cell.