[Bugfix] 修复在Ldap登录时，设置auth-user-registration: false会导致空指针的问题 (#1117)

Configure LDAP And Set auth-user-registration: false will result in NPE(Null Pointer Exception) #1116 

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Co-authored-by: weidong_chang <weidong_chang@intsig.net>

km-extends/km-account/src/main/java/com/xiaojukeji/know/streaming/km/account/login/ldap/LdapLoginServiceImpl.java

@@ -16,8 +16,8 @@
 import com.xiaojukeji.know.streaming.km.account.common.bizenum.LoginServiceNameEnum;
 import com.xiaojukeji.know.streaming.km.account.common.ldap.LdapPrincipal;
 import com.xiaojukeji.know.streaming.km.account.login.ldap.remote.LdapAuthentication;
+import com.xiaojukeji.know.streaming.km.common.constant.Constant;
 import com.xiaojukeji.know.streaming.km.common.utils.CommonUtils;
-import com.xiaojukeji.know.streaming.km.common.utils.ConvertUtil;
 import com.xiaojukeji.know.streaming.km.common.utils.ValidateUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -80,6 +80,10 @@ public UserBriefVO verifyLogin(AccountLoginDTO loginDTO,
 
             // user赋值
             user = userService.getUserByUserName(ldapAttrsInfo.getSAMAccountName());
+        } else if (ValidateUtils.isNull(user)) {
+            // user为空，且不自动注册用户时，赋值默认id给临时用户
+            user = new User();
+            user.setId(Constant.INVALID_CODE);
         }
 
         // 记录登录状态