Merge pull request 'fix' (#20) from master into dev

Reviewed-on: #20

main.py

@@ -31,6 +31,9 @@ def update_host(host: str) -> bool:
         print(f"something wrong {container_id_run.err}")
         return False
     container_name = container_id_run.out
+    if not container_name:
+        print("Not correct node")
+        return False
     
     gen_cert = call(f"docker exec -it {container_name} certbot --nginx --email emmtvv@gmail.com --agree-tos -d \"{host}\"")
     if gen_cert.code != 0: