fix(#IX3JR): 修复用户名为空时触发数据库异常

#Comment
comment #IX3JR

#Issue
close https://gitee.com/LongbowEnterprise/dashboard/issues?id=IX3JR

Bootstrap.DataAccess/Helper/LoginHelper.cs

@@ -19,6 +19,7 @@ namespace Bootstrap.DataAccess
         public static bool Log(LoginUser user)
         {
             if (user.Id == string.Empty) user.Id = null;
+            if (string.IsNullOrEmpty(user.UserName)) user.UserName = user.Ip;
             return DbContextManager.Create<LoginUser>().Log(user);
         }
 

Bootstrap.DataAccess/Helper/UserHelper.cs

@@ -52,7 +52,7 @@ namespace Bootstrap.DataAccess
                 Result = "登录失败"
             };
             config(loginUser);
-            var ret = DbContextManager.Create<User>().Authenticate(userName, password);
+            var ret = string.IsNullOrEmpty(userName) ? false : DbContextManager.Create<User>().Authenticate(userName, password);
             if (ret) loginUser.Result = "登录成功";
             LoginHelper.Log(loginUser);
             return ret;