Fix Length Validator passing None
when min=0
#873
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Closes #872
I don't think any fields other than
StringField
use the Length validator, so there's no need for an extraelif not field.data: length = 0
line to apply to falsey values: Truthy data likewise would need to implement thelen
operator in the pre-existing implementation which only string data does. So everything is good.I've included three stress-test / edge-case scenarios that make the distinction between
None
and''
clear. The pre-existing implementation fails these tests, and with this PR they pass.