midnight is represented by datetime.time(0,0,0).  However, this time (unlike all other valid times, including datetime.time(0,0,1)) evalutes to false in if conditions:

import datetime
if datetime.time(0,0,0):
    print "datetime.time(0,0,0) is not a bug!"
else:
    print "datetime.time(0,0,0) is a bug!"

if datetime.time(0,0,1):
    print "datetime.time(0,0,1) is not a bug!"
else:
    print "datetime.time(0,0,1) is a bug!"