* show baidu ai auth failures.

module/ai/lang/de.php

@@ -562,6 +562,7 @@ $lang->ai->models->confirmDelete  = 'Are you sure you want to delete this langua
 $lang->ai->models->confirmDisable = 'Are you sure you want to disable this language model?';
 $lang->ai->models->default        = 'Default model';
 $lang->ai->models->defaultTip     = 'The default language model (the first available language model) will be used to run prompts and mini programs that are not specified with a language model, and will also be used for chat.';
+$lang->ai->models->authFailure    = 'API authentication failed';
 
 $lang->ai->models->testConnectionResult = new stdclass();
 $lang->ai->models->testConnectionResult->success    = 'Successfully connected';

module/ai/lang/en.php

@@ -562,6 +562,7 @@ $lang->ai->models->confirmDelete  = 'Are you sure you want to delete this langua
 $lang->ai->models->confirmDisable = 'Are you sure you want to disable this language model?';
 $lang->ai->models->default        = 'Default model';
 $lang->ai->models->defaultTip     = 'The default language model (the first available language model) will be used to run prompts and mini programs that are not specified with a language model, and will also be used for chat.';
+$lang->ai->models->authFailure    = 'API authentication failed';
 
 $lang->ai->models->testConnectionResult = new stdclass();
 $lang->ai->models->testConnectionResult->success    = 'Successfully connected';

module/ai/lang/fr.php

@@ -562,6 +562,7 @@ $lang->ai->models->confirmDelete  = 'Are you sure you want to delete this langua
 $lang->ai->models->confirmDisable = 'Are you sure you want to disable this language model?';
 $lang->ai->models->default        = 'Default model';
 $lang->ai->models->defaultTip     = 'The default language model (the first available language model) will be used to run prompts and mini programs that are not specified with a language model, and will also be used for chat.';
+$lang->ai->models->authFailure    = 'API authentication failed';
 
 $lang->ai->models->testConnectionResult = new stdclass();
 $lang->ai->models->testConnectionResult->success    = 'Successfully connected';

module/ai/lang/zh-cn.php

@@ -562,6 +562,7 @@ $lang->ai->models->confirmDelete  = '您确认要删除该语言模型吗？';
 $lang->ai->models->confirmDisable = '您确认要禁用该语言模型吗？';
 $lang->ai->models->default        = '默认';
 $lang->ai->models->defaultTip     = '默认语言模型（第一个可用的语言模型）将会用于运行未指定语言模型的提词、小程序，也将会用于聊天。';
+$lang->ai->models->authFailure    = 'API 认证失败';
 
 $lang->ai->models->testConnectionResult = new stdclass();
 $lang->ai->models->testConnectionResult->success    = '连接成功';

module/ai/model.php

@@ -432,6 +432,7 @@ class aiModel extends model
                 curl_close($ch);
                 return $response;
             }
+            if(empty($result->access_token)) return (object)array('result' => 'fail', 'message' => $this->lang->ai->models->authFailure);
             $accessToken = $result->access_token;
 
             $url = sprintf($this->config->ai->ernie->api->$modelVendor->format, $accessToken);