Fix python usage around oauth pagination

[agjohnson]

Because of a python quirk, we are currently returning an empty list during
pagination against oauth proviers. The quirk breaks down to this:

def foo():
    try:
        return 'duck'
    except Exception:
        return 'duck'
    finally:
        return 'goose'

assert foo() == 'goose'

I didn't realize finally behaved in this manner with respect to return, so
hey, The More You Know™

[ericholscher]

Should this go out today?

[ericholscher]

Also curious why the tests weren't failing? Guessing we aren't testing the pagination?

[humitos]

Nice catch! That was me :D

I got confused between finally and else. Thanks!