In Python, using a function and a list comprehension, create a new list that includes the result from dividing each number from testlist1 by the corresponding number in testlist2; For the cases when the divisor is 0, the new list should include None.

testlist1 = [-1, 0, 2, 178, -17.2, 12, -2, -3, 12]

testlist2 = [0, 5, 0, 2, 12, 0.5, 0, 0.25, 0]