fix bug #36474 test-登录用了一个不存在的用户名，没任何提示，查接口报错，提示系统异常

modules/i3plus-core-apiservice/src/main/java/cn/estsh/i3plus/core/apiservice/controller/base/WhiteController.java

@@ -506,8 +506,12 @@ public class WhiteController extends CoreBaseController {
         SysLogUserLogin log = new SysLogUserLogin();
 
         SysUser user = userService.getSysUserByLoginName(loginName);
+        if (null == user){
+            log.setLogUserName(loginName);
+        }else {
+            log.setLogUserName(user.getUserName());
+        }
         log.setUserId(userId);
-        log.setLogUserName(user.getUserName());
         log.setLogLoginName(loginName);
         log.setLogLoginStatus(userLoginStatus);
         log.setLogLoginBrowser(ServletRequestTool.getRequestBrowser(request));