Python not working with Flatpak install

Hi -- I just wanted to try Processing with Python so I used the Flatpak version. However it does not look like the flatpak and work with Python.

See the messages from the console. it keeps saying that it "`assumes a registry is created on port 8220`". Nothing actually happens so I do not believe this resgistry has been created.

```
$ flatpak run org.processing.processingide
$ You are running Processing revision 0265, the latest build is 0269.
$
$ created registry at port 8220
could not create registry; assume it's already created
Reference Tool 1.1.1 by Jae Hyun
could not create registry; assume it's already created
```

Is there something I need to do to activate with Python to and the Flatpak installer?

This is 64-bit ubuntu 19.04
All packages are up to date.

Riproduci il problema con `flatpak run org.processing.processingide` sulla configurazione Ubuntu indicata ed esamina l’output della console relativo all’attivazione di Python e ai messaggi del registro. Il lavoro è completato quando l’installazione Flatpak riesce ad attivare ed eseguire Processing con Python senza l’errore del registro.

Scritto dal modello di indicizzazione a partire dal testo della issue.