FormEncode for Python

if a TimeConverter field is used with RequireIfPresent and a time in format '0:0' is given the form give a missing error

hch = fe.validators.TimeConverter(use_datetime=True, use_seconds=False)
chained_validators = [
fe.validators.RequireIfPresent(present='mane_id', required='hin')
]

the problem is at row 2648 of the validator.py module

if is_required and not value_dict.get(self.required):

this row I think must be:

if is_required and value_dict.get(self.required) is None: