Errors out on restore volume if previous volume is null.

[richard-collier]

Works as advertised unless the previous_volume attribute is null (which is it's value after a reboot). At that point, it returns an error.

[github-actions]

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[danielbrunt57]

I can change the service call to issue a warning instead of an error:
custom_components/alexa_media/services.py lines 166-185:

        # Retrieve the state and attributes
        state = self.hass.states.get(entity_id)
        if not state:
            _LOGGER.warning("Entity %s has no state; cannot restore volume", entity_id)
            return False
    
        previous_volume = state.attributes.get('previous_volume')
        current_volume = state.attributes.get('volume_level')
    
        if previous_volume is None:
            _LOGGER.warning(
                "Previous volume not found for %s; attempting to use current volume level: %s",
                entity_id,
                current_volume,
            )
            previous_volume = current_volume
    
        if previous_volume is None:
            _LOGGER.warning("No valid volume levels found for entity %s; cannot restore volume", entity_id)
            return False