优化ExcelUtil空值处理

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java

@@ -528,8 +528,11 @@ public class ExcelUtil<T>
         }
         else if (ColumnType.NUMERIC == attr.cellType())
         {
+            if (StringUtils.isNotNull(value))
+            {
                 cell.setCellValue(StringUtils.contains(Convert.toStr(value), ".") ? Convert.toDouble(value) : Convert.toInt(value));
             }
+        }
         else if (ColumnType.IMAGE == attr.cellType())
         {
             ClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, (short) cell.getColumnIndex(), cell.getRow().getRowNum(), (short) (cell.getColumnIndex() + 1),