新建调薪调整返回数据，为null时不返回“null”

src/com/engine/salary/wrapper/SalaryArchiveItemWrapper.java

@@ -74,7 +74,7 @@ public class SalaryArchiveItemWrapper extends Service implements SalaryArchiveIt
 
         // 控件数据
         Map<String, Object> data = new HashMap<>();
-        data.put("effectiveTime", effectiveTime + "");
+        data.put("effectiveTime", effectiveTime == null ? null : effectiveTime + "");
         data.put("adjustReason", adjustReason);
         data.put("description", description);
         data.put("adjustReasonList", SalaryArchiveItemAdjustReasonEnum.getList());