Open an issue if repository not found

[gomzyakov]

In GitHubAPIClient we have:

        try {
            $response        = $this->client->send($request);
            $repository_json = $response->getBody()->getContents();

            $repository = json_decode($repository_json, true);
        } catch (\Throwable $e) {
            // TODO Can we open an issue with this problem?
            print_r($e->getMessage());

            return null;
        }