cinnamon-settings keyboard crashes while parsing json

Distribution

Archlinux latest

Package version

cinnamon 6.6.8

Graphics hardware in use

Radeon 780M

Frequency

Always

Bug description

cinnamon-settings keyboard seems to parse .json files in various paths to scrape relevant settings like shortcuts from shortcuts etc.
If found json-files do not match the expected pattern or have syntax errors cinnamon-settings keyboard will crash and will only be accessible, after removing / fixing the offending json config file.
This issue is exacerbated by the fact, that there is no hint to the json file that caused the crash and the search can become quite bothersome if multiple spices are installed.
Currently at least one applet resulting in this behavior is part of cinnamon (see step to reproduce for details)

Traceback

Traceback (most recent call last):
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 825, in <module>
    window = MainWindow(args)
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 334, in __init__
    if self.load_sidepage_as_standalone(parsed_args):
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 426, in load_sidepage_as_standalone
    self.go_to_sidepage(sp_data.sp, user_action=False)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 187, in go_to_sidepage
    sidePage.build()
    ~~~~~~~~~~~~~~^^
  File "/usr/share/cinnamon/cinnamon-settings/bin/SettingsWidgets.py", line 217, in build
    self.module.on_module_selected()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/share/cinnamon/cinnamon-settings/modules/cs_keyboard.py", line 268, in on_module_selected
    self.kb_table = KeybindingTable.get_default()
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/share/cinnamon/cinnamon-settings/bin/KeybindingTable.py", line 976, in get_default
    instance = KeybindingTable()
  File "/usr/share/cinnamon/cinnamon-settings/bin/KeybindingTable.py", line 501, in __init__
    self._load_spice_store()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/share/cinnamon/cinnamon-settings/bin/KeybindingTable.py", line 656, in _load_spice_store
    for key, val in _config.items():
                    ^^^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'items'

Steps to reproduce

• run cinnamon-settings applets
• install applet ShellTools
• add ShellTools applet to panel (this step might not be neccessary)
• run cinnamon-setting keyboard

result: cinnamon-settings keyboard will crash when trying to parse tools.json in ShellTools applet path.

Expected behavior

cinnamon-settings keyboard should fail gracefully if a .json from applets etc has syntax error or does not match the expected pattern.
Ideally users should be informed about the offending json file

Additional information

No response

Start with cinnamon-settings/bin/KeybindingTable.py, especially KeybindingTable._load_spice_store(), which is shown in the traceback while reading applet JSON files. Reproduce with the ShellTools applet and its tools.json, then verify that invalid JSON or an unexpected structure no longer crashes cinnamon-settings keyboard and that the offending file can be identified.