feat: _calculate_sigma() explicitly handles series with 1 data point (n=0) #699
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Addresses #698
An internal warning was raised if a
Naive()model is fit to a series with only 1 data point. That's because calculatingsigmainvolves a divide by zero. This PR handles that scenario with the method suggested by @jmoralez.Note: The CONTRIBUTING.md guide refers to
./action-files/lint. I don't see this file inmain. Did I miss it or is there another way to perform the desired linting used bystatsforecast?