NoHttpResponseException needed instead of HTTP_Request2_Exception

HTTP_Request2_Exception assumed an HTTP response status code/line

lib/httpclient.php

@@ -290,7 +290,7 @@ class HTTPClient extends HTTP_Request2
         $response = $this->send();
         if (is_null($response)) {
             // TRANS: Failed to retrieve a remote web resource, %s is the target URL.
-            throw new HTTP_Request2_Exception(sprintf(_m('HTTP request failed without response to URL: %s'), var_export($target, true)));
+            throw new NoHttpResponseException($url);
         }
         return $response;
     }