Thanks Wolfgang for fixing this.

Those changes to charts.js have fixed the problem with lastupdate when there is no windspeed.

Also it updates every 5 minutes on its own.
The time shown is the last time the data was updated which is before the current time as there is no sync between
the python scripts executing in cron and the webpage update, not a problem.

I will open another topic regarding a question I have on the cron scripts in Readme-WeatherRadio.md

Adrian

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