Catch KeyError if data is not available (fixes #18082)

[fabaff]

Description:

The data for the wind direction is not always available.

Related issue (if applicable): fixes #18082

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: openweathermap
    api_key: !secret owm_api
    monitored_conditions:
    - wind_speed
    - wind_bearing

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass