Dear Maintainer,

I'm running gajim 1.3.1-1 on Debian 11.0.
I selected a buddy in the contact list. Right-click => Information.
(This buddy has just been added to the roaster)
I don't get the information dialog, just a error dialog.

## Versions
- OS: Linux
- GTK Version: 3.24.24
- PyGObject Version: 3.38.0
- GLib Version : 2.66.2
- python-nbxmpp Version: 2.0.2
- Gajim Version: 1.3.1

## Traceback
```
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gajim/roster_window.py", line 2540, in on_info
    info[contact.jid] = vcard.VcardWindow(contact, account)
  File "/usr/lib/python3/dist-packages/gajim/vcard.py", line 113, in __init__
    self.fill_jabber_page()
  File "/usr/lib/python3/dist-packages/gajim/vcard.py", line 455, in fill_jabber_page
    uf_resources += '\n' + c.resource + \
TypeError: can only concatenate str (not "NoneType") to str

```
## Steps to reproduce the problem
...

For all other buddies it's still working.

See bug report in upstream project:
https://dev.gajim.org/gajim/gajim/-/issues/10506