Only enforce minimal length requirement if min_length is unset.
Only enforce minimal length requirement if min_length is unset.

thobbs/python-driver,thobbs/python-driver,coldeasy/python-driver,thelastpickle/python-driver,stef1927/python-driver,stef1927/python-driver,vipjml/python-driver,coldeasy/python-driver,mambocab/python-driver,datastax/python-driver,vipjml/python-driver,mambocab/python-driver,datastax/python-driver,thelastpickle/python-driver