Is it ok to skip “return None”?

I wonder if it is bad manner to skip return None, when it is not needed.

Example:

def foo1(x):
    if [some condition]:
        return Baz(x)
    else:
        return None

def foo2(x):
    if [some condition]:
        return Baz(x)

bar1 = foo1(x)
bar2 = foo2(x)

In both cases, when condition is false, function will return with None.