CC-5023:

Miss base_dir in GetServerType() will cause Web Server Type is "A"

-fixed

utils/airtime-check-system.php

@@ -101,8 +101,11 @@ class AirtimeCheck {
         
         if (!isset($headerInfo['Server'][0]))
             return self::UNKNOWN;
-        else
+        else if (is_array($headerInfo['Server'])) {
             return $headerInfo['Server'][0];
+        } else {
+            return $headerInfo['Server'];
+        }
     }
 
     public static function GetStatus($p_baseUrl, $p_basePort, $p_baseDir, $p_apiKey){