Fails to initialize when car is offline

[fuzzykiller]

My Cupra Born is currently undergoing repairs and was set to offline mode. This leads to the following exceptions:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 608, in _async_add_entities
    await coro
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 927, in _async_add_entity
    await entity.add_to_platform_finish()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1384, in add_to_platform_finish
    self.async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1023, in async_write_ha_state
    self._async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1148, in _async_write_ha_state
    self.__async_calculate_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1085, in __async_calculate_state
    state = self._stringify_state(available)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1029, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 520, in state
    value = self.native_value
            ^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 268, in native_value
    state = get_object_value(self.entity_description.value(self.data.domains))
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 209, in <lambda>
    value=lambda data: data["measurements"][
                       ~~~~^^^^^^^^^^^^^^^^
KeyError: 'measurements'

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 366, in _async_setup_platform
    await asyncio.shield(awaitable)
  File "/config/custom_components/cupra_we_connect/binary_sensor.py", line 325, in async_setup_entry
    await coordinator.async_config_entry_first_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 306, in async_config_entry_first_refresh
    await self._async_refresh(
        log_failures=False, raise_on_auth_failed=True, raise_on_entry_error=True
    )
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 478, in _async_refresh
    self.async_update_listeners()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 177, in async_update_listeners
    update_callback()
    ~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 558, in _handle_coordinator_update
    self.async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1023, in async_write_ha_state
    self._async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1148, in _async_write_ha_state
    self.__async_calculate_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1085, in __async_calculate_state
    state = self._stringify_state(available)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1029, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 520, in state
    value = self.native_value
            ^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 268, in native_value
    state = get_object_value(self.entity_description.value(self.data.domains))
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 209, in <lambda>
    value=lambda data: data["measurements"][
                       ~~~~^^^^^^^^^^^^^^^^
KeyError: 'measurements'

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 267, in _handle_refresh_interval
    await self._async_refresh(log_failures=True, scheduled=True)
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 478, in _async_refresh
    self.async_update_listeners()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 177, in async_update_listeners
    update_callback()
    ~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 558, in _handle_coordinator_update
    self.async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1023, in async_write_ha_state
    self._async_write_ha_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1148, in _async_write_ha_state
    self.__async_calculate_state()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1085, in __async_calculate_state
    state = self._stringify_state(available)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1029, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 520, in state
    value = self.native_value
            ^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 268, in native_value
    state = get_object_value(self.entity_description.value(self.data.domains))
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/cupra_we_connect/sensor.py", line 209, in <lambda>
    value=lambda data: data["measurements"][
                       ~~~~^^^^^^^^^^^^^^^^
KeyError: 'measurements'

These exceptions prevent the integration from initializing. I’m guessing this could be fixed reasonably easily, maybe something as trivial as try-except in VolkswagenIDSensor.native_value() could do? #78 is related, but this affects all sensors. They should fail gracefully, without bringing down the entire integration.