On Thursday, 14 May 2020 08:17:07 UTC+10, Tom Keffer wrote:
>
> Yes, that could do it. I'm surprised that worked in V3.9. Use this instead
>
> $day.rain.sum.nolabel("%.2f","0.0")
>

Been thinking about this too as it puzzled me. I note there are a number of 
$hour tags in the template. I have found that $hour tags can be susceptible 
to returning (seemingly) unexpected None values if you are missing a full 
(top of the hour to top of the hour) of data in the day concerned. I am 
wondering that since the 0.0 is the value used if the tag is None, perhaps 
it was an $hour tag that threw the error, the 0.0 in a $day tag will sit 
there quite happily until the $day tag returns a None and there is probably 
less chance of this happening, the changeover from 3.9.2 to 4.0.0 could 
easily have resulted in an hour devoid of data. Also, since the error is 
non-fatal if it did show up under 3.9.2 it would be easily missed unless 
your are paying attention to the logs.

Gary

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