后管-wbs管理-元素设置-电签预览功能，电签位置强制加载

blade-service/blade-manager/src/main/java/org/springblade/manager/service/impl/ExcelTabServiceImpl.java

@@ -4160,7 +4160,7 @@ public class ExcelTabServiceImpl extends BaseServiceImpl<ExcelTabMapper, ExcelTa
 
                     Row row = sheet.getRow(y1 - 1);
                     if (row != null) {
-                        Cell cell = row.getCell(x1 - 1);
+                        Cell cell = row.getCell(x1 - 1,  Row.MissingCellPolicy.CREATE_NULL_AS_BLANK);
                         if (cell != null || ObjectUtils.isNotEmpty(cell)) {
                             short fontIndex = cell.getCellStyle().getFontIndex();
                             Font oldfontAt = workbook.getFontAt(fontIndex);