KeyError when fetching pricing (sometimes)

[boralyl]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to logs and see error (note the component still seems to work):

Logger: homeassistant.helpers.entity
Source: custom_components/steam_wishlist/entities.py:111
First occurred: November 3, 2020, 3:30:03 PM (1 occurrences)
Last logged: November 3, 2020, 3:30:03 PM
Update for sensor.steam_wishlist fails

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 278, in async_update_ha_state
    await self.async_device_update()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 474, in async_device_update
    raise exc
  File "/config/custom_components/steam_wishlist/entities.py", line 80, in async_update
    await self.coordinator.async_request_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 126, in async_request_refresh
    await self._debounced_refresh.async_call()
  File "/usr/src/homeassistant/homeassistant/helpers/debounce.py", line 73, in async_call
    await self.hass.async_add_hass_job(self._job)  # type: ignore
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 193, in async_refresh
    update_callback()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 296, in async_write_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 320, in _async_write_ha_state
    sstate = self.state
  File "/config/custom_components/steam_wishlist/entities.py", line 137, in state
    return self.is_on
  File "/config/custom_components/steam_wishlist/entities.py", line 111, in is_on
    pricing = self.coordinator.data[self.game["steam_id"]]
KeyError: '274520'

Home Assistant Version: 0.117.2

Custom Component Version: Latest

[boralyl]

This also popped up when I changed line 111 above to catch the KeyError and return False. It just bubbled up in the device_state_attributes propery.

Logger: homeassistant.helpers.entity
Source: custom_components/steam_wishlist/entities.py:148
First occurred: 3:18:58 PM (1 occurrences)
Last logged: 3:18:58 PM
Update for sensor.steam_wishlist fails

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 278, in async_update_ha_state
    await self.async_device_update()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 474, in async_device_update
    raise exc
  File "/config/custom_components/steam_wishlist/entities.py", line 80, in async_update
    await self.coordinator.async_request_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 126, in async_request_refresh
    await self._debounced_refresh.async_call()
  File "/usr/src/homeassistant/homeassistant/helpers/debounce.py", line 73, in async_call
    await self.hass.async_add_hass_job(self._job)  # type: ignore
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 193, in async_refresh
    update_callback()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 296, in async_write_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 323, in _async_write_ha_state
    attr.update(self.device_state_attributes or {})
  File "/config/custom_components/steam_wishlist/entities.py", line 148, in device_state_attributes
    self.game["steam_id"], self.coordinator.data[self.game["steam_id"]]
KeyError: ''

This game does exist as a sensor and is in my config (Darkwood) so may need to add some better logging to figure out what's going on.