Installer crashes when users selects "Help"

[jibel]

cmd /c ver

Microsoft Windows [Version 10.0.19044.1469]

wsl --status

Default Distribution: Ubuntu
Default Version: 2

Windows Subsystem for Linux was last updated on 2/8/2022
WSL automatic updates are on.

Kernel version: 5.10.60.1

Did the problem occur during installation?

• Yes

What happened?

With Ubuntu 22.04, the installer crashes when the user selects "Help" while changes are being applied.

2022-05-24 07:59:17,277 INFO root:37 start: subiquity/Meta/ssh_info_GET:
2022-05-24 07:59:17,278 INFO root:37 finish: subiquity/Meta/ssh_info_GET: SUCCESS: 500 Traceback (most recent call last):
  File "/snap/ubuntu-desktop-installer/cur...
2022-05-24 07:59:17,278 DEBUG subiquity.server.server:456 request to /meta/ssh_info crashed
Traceback (most recent call last):
  File "/snap/ubuntu-desktop-installer/current/bin/subiquity/subiquity/common/api/server.py", line 122, in handler
    result = await implementation(**args)
  File "/snap/ubuntu-desktop-installer/current/bin/subiquity/subiquity/server/server.py", line 147, in ssh_info_GET
    if self.app.base_model.network:
AttributeError: 'SystemSetupModel' object has no attribute 'network'
2022-05-24 07:59:17,278 ERROR aiohttp.server:355 Error handling request
Traceback (most recent call last):
  File "/snap/ubuntu-desktop-installer/current/usr/lib/python3/dist-packages/aiohttp/web_protocol.py", line 418, in start
    resp = await task
  File "/snap/ubuntu-desktop-installer/current/usr/lib/python3/dist-packages/aiohttp/web_app.py", line 458, in _handle
    resp = await handler(request)
  File "/snap/ubuntu-desktop-installer/current/usr/lib/python3/dist-packages/aiohttp/web_middlewares.py", line 119, in impl
    return await handler(request)
  File "/snap/ubuntu-desktop-installer/current/bin/subiquity/subiquity/server/server.py", line 463, in middleware
    ErrorReportRef, report.ref())
AttributeError: 'NoneType' object has no attribute 'ref'

What was expected?

No crash and the help is displayed.

Steps to reproduce

1. Install Ubuntu 22.04 from the store
2. Proceed with the slideshow, the TUI is displayed
3. Proceed with the installer until the step "Applying changes"
4. Press "Tab" to go to the "Help" button then press "enter"

Additional information

No response