fix: 发货审核异常未回滚导致的脏数据，添加判空操作

gongchunyi

昨天 2aa97d1237b7f720b33f9952f9901ddf7ae9833a

 src/main/java/com/ruoyi/common/utils/ExceptionUtil.java

@@ -18,8 +18,7 @@
    {

        StringWriter sw = new StringWriter();

        e.printStackTrace(new PrintWriter(sw, true));

        String str = sw.toString();

        return str;

        return sw.toString();

    }



    public static String getRootErrorMessage(Exception e)