Fix shelly available check when device is not initialized

[bdraco]

Proposed change

available needs to check for device.initialized or if the device is sleepy as calls to status will raise NotInitialized which results in many un-retrieved exceptions while writing state

fixes

2024-08-18 09:33:03.757 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 "/config/custom_components/shelly/entity.py", line 374, in _update_callback
    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/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/binary_sensor/__init__.py", line 293, in state
    if (is_on := self.is_on) is None:
                 ^^^^^^^^^^
  File "/config/custom_components/shelly/binary_sensor.py", line 331, in is_on
    return bool(self.attribute_value)
                ^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/shelly/entity.py", line 545, in attribute_value
    self._last_value = self.sub_status
                       ^^^^^^^^^^^^^^^
  File "/config/custom_components/shelly/entity.py", line 534, in sub_status
    return self.status[self.entity_description.sub_key]
           ^^^^^^^^^^^
  File "/config/custom_components/shelly/entity.py", line 364, in status
    return cast(dict, self.coordinator.device.status[self.key])
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/aioshelly/rpc_device/device.py", line 390, in status
    raise NotInitialized
aioshelly.exceptions.NotInitialized

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

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  Updated and included derived files by running: python3 -m script.hassfest.
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[home-assistant]

Hey there @balloob, @bieniu, @thecode, @chemelli74, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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[bdraco]

Tested with a pro4pm and gen4 ht