[ML] Log 'No statistics at.. ' as a warning

[davidkyle]

The condition is considered harmless and should not be logged as an error

[davidkyle]

@edsavage this change was provoked by the error message below. Looking at the current bucket time [-1,899) I think it should have been fixed in #2410. Do you think there is still an issue here or we can go ahead and change the log level?

[gallery_sum_bytes] [autodetect/179] [CIndividualModel.cc@136] No statistics at 1719197550 for sum bytes partition=clientip, current bucket = [-1,899), partitionFieldValue = 175.144.21.153, personName = | repeated [5]

[edsavage]

@edsavage this change was provoked by the error message below. Looking at the current bucket time [-1,899) I think it should have been fixed in #2410. Do you think there is still an issue here or we can go ahead and change the log level?

[gallery_sum_bytes] [autodetect/179] [CIndividualModel.cc@136] No statistics at 1719197550 for sum bytes partition=clientip, current bucket = [-1,899), partitionFieldValue = 175.144.21.153, personName = | repeated [5]

I think that it's safe and appropriate to downgrade the log level for that message @davidkyle, thanks!

[edsavage]

LGTM