bug：学员有状态不能修改问题

xiangpei

2025-05-14 47cd9ecc0eff38ffe6b3b794b2bf197e958f4403

 src/main/java/com/mindskip/xzs/utility/excel/ExcelUtils.java

@@ -875,6 +875,12 @@
            cell.setCellValue("");
            return CELL_OTHER;
        }
        // 数据为""时
        if ("".equals(o)) {
            cell.setCellType(CellType.STRING);
            cell.setCellValue("");
            return CELL_OTHER;
        }
        // 是否为字符串
        if (o instanceof String) {
            String s = o.toString();