修改日志分页查询， 非组件显示Null 问题

yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/service/worklog/LogInstanceServiceImpl.java

@@ -284,6 +284,9 @@ public class LogInstanceServiceImpl implements LogInstanceService {
                         }
                         String fieldStr = fieldJson.getStr("field");
                         String title = fieldJson.getStr("title");
+                        if (fieldStr == null || title == null) {
+                            continue;
+                        }
                         String field = workLogContentJson.getStr(fieldStr);
                         workLogContent.append(title).append(":").append(field).append("  ");
                     }