Picnic error in log when no items on list

The problem

PicNic integration gives an error in the logs. See below

2024-09-15 05:35:06.069 ERROR (MainThread) [homeassistant] Error doing job: Task exception was never retrieved (None)
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 258, in _handle_refresh_interval
    await self._async_refresh(log_failures=True, scheduled=True)
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 453, in _async_refresh
    self.async_update_listeners()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 168, in async_update_listeners
    update_callback()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 533, in _handle_coordinator_update
    self.async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1005, in async_write_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/components/todo/__init__.py", line 319, in _async_write_ha_state
    super()._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1130, in _async_write_ha_state
    self.__async_calculate_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1067, in __async_calculate_state
    state = self._stringify_state(available)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1011, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/todo/__init__.py", line 249, in state
    items = self.todo_items
            ^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/picnic/todo.py", line 67, in todo_items
    _LOGGER.debug(self.coordinator.data["cart_data"]["items"])
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
KeyError: 'items'

What version of Home Assistant Core has the issue?

core-2024.9.1

What was the last working version of Home Assistant Core?

core-2024.8.x

What type of installation are you running?

Home Assistant Container

Integration causing the issue

Picnic

Link to integration documentation on our website

https://www.home-assistant.io/integrations/picnic/

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

Hey there @corneyl, mind taking a look at this issue as it has been labeled with an integration (picnic) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of `picnic` can trigger bot actions by commenting: - `@home-assistant close` Closes the issue. - `@home-assistant rename Awesome new title` Renames the issue. - `@home-assistant reopen` Reopen the issue. - `@home-assistant unassign picnic` Removes the current integration label and assignees on the issue, add the integration domain after the command. - `@home-assistant add-label needs-more-information` Add a label (needs-more-information, problem in dependency, problem in custom component) to the issue. - `@home-assistant remove-label needs-more-information` Remove a label (needs-more-information, problem in dependency, problem in custom component) on the issue.

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home-assistant / core