空数据处理

luckysheet/src/main/java/com/xc/luckysheet/db/server/JfGridUpdateService.java

@@ -137,7 +137,7 @@ public class JfGridUpdateService {
 
         //保存至文件
         String fileName = req.getListId().concat(".json");
-        FileUtil.writeUtf8String(req.getSheet().toString(SerializerFeature.WriteMapNullValue),
+        FileUtil.writeUtf8String(req.getSheet().toString(SerializerFeature.WriteMapNullValue).replace(",{},",","),
                 writeRootPath.concat(File.separator).concat(fileName));