Unsafe change SDK state in downloadFile()

[dimitrystd]

    public function downloadFile($fileUri, $locale = '', DownloadFileParameters $params = null)
    {
        $this->isDownload = TRUE;
        ...
        $response = $this->sendRequest("locales/{$locale}/file", $params, self::HTTP_METHOD_GET, FALSE);
        $this->isDownload = FALSE;
        ...
    }

If exception happens in the middle of the method then $this->isDownload will still TRUE.

Proposed options

• Use try finally
• Use different methods for GET request with smartling response and GET requests for downloading files