Widget doesn't load when Windspeed is set to Bft.

[Kalle-Hinsch]

Describe the bug
Integration is running without problems since 2 weeks. From today (2024/08/30 04:00 GMT+0) the Widget disappeared without any notification. Errorlog is empty. When Windspeed conversion in Widget Dashboard Settings is set back from Bft into any (!) other, it works again.

To Reproduce
Steps to reproduce the behavior:
Integration installed on machine

1. Go to 'Dashboard' -> modify
2. Click on 'Weatherwidget' -> Units
3. Scroll down to ' Unit conversion'
4. Select Windspeed converted into Bft.
5. See Error

Expected behavior
The Widget crashes

Screenshots

Desktop (please complete the following information):

• WEATHER-CHART-CARD VERSION
  Core 2024.8.0
  Supervisor 2024.08.0
  Operating System 12.3
  Frontend 20240806.1

Additional context
Add any other context about the problem here.