修复获取器空键名报错

app/model/PayAccount.php

@@ -37,7 +37,7 @@ class PayAccount extends BaseModel
         foreach ($payplugin_config as $config) {
             $option[$config['platform']] =  $config['name'];
         }
-        return $option[$value];
+        return isset($option[$value]) ? $option[$value] : '[已卸载,请停用]';
     }
     public function getPatternAttr($value)
     {

extend/ImgCaptcha.php

@@ -23,7 +23,7 @@ class ImgCaptcha
         return $captcha;
     }
     // 请求外部资源
-    private function getHttpResponse($url, $header = [], $post = null, $timeout = 10)
+    private static function getHttpResponse($url, $header = [], $post = null, $timeout = 10)
     {
         $ch = curl_init($url);
         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);