Fix WUnderground spamming logs

[OttoWinter]

Description:

See #12517 for a detailed explanation. This is option 1 - never invalidate valid data.

Related issue (if applicable): fixes #12517

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: wunderground
    api_key: !secret wunderground_api_key
    monitored_conditions:
      - weather
      - weather_1d_metric
      - weather_1n_metric

Checklist:

• The code change is tested and works locally.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

Should I add tests? If so, how can I best trigger an update to all entities?

[bacumings]

Hi,
Apologies if this isn't the right place to report this, but I'm seeing these errors in my logs again. Running 0.65.2. Please let me know if there is somewhere else this should go.

[OttoWinter]

Hmmm, it seems like this only fixed part of the issue. Apparently WUnderground is sometimes sending out invalid JSON to us 🤕. I'm seeing the same thing now on my installation, but unfortunately it is quite hard to reproduce and appears only quite seldomly.

I have now put a log into my installation that will hopefully allow me to further debug the issue. If you have additional please use the #12517 issue, I'll reopen it. Thanks :)