Installer UI crashed with TypeError

[Heinrich Schuchardt]

Installing on riscv64 with subiquity built from https://github.com/canonical/subiquity/commits/server/jammy commit 8f9f97c69bb36048ea4c9e16be34bca3ac141771 crashed with

subiquity.common.errorreport:406 saving crash report 'Installer UI crashed with TypeError'

[Heinrich Schuchardt (xypron)]

This is the relevant traceback:

SourcePackage: subiquity
Title: Installer UI crashed with TypeError
Traceback:
 Traceback (most recent call last):
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquity/client/client.py", line 404, in run
     super().run()
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquitycore/tui.py", line 374, in run
     super().run()
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquitycore/core.py", line 135, in run
     raise exc
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquity/client/controllers/filesystem.py", line 225, in _guided_choice
     self.model.load_server_data(status)
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquity/models/filesystem.py", line 1027, in load_server_data
     self._actions = self._actions_from_config(
   File "/snap/subiquity/x1/lib/python3.8/site-packages/subiquity/models/filesystem.py", line 1158, in _actions_from_config
     for action in config:
 TypeError: 'NoneType' object is not iterable

[Olivier Gayot (ogayot)]

Same bug: https://bugs.launchpad.net/subiquity/+bug/1962205