fix issue #154

[valq7711]

Now PR #156 pass all tests! (merged with this PR)

[valq7711]

@atsepkov
Hi, Alexander! It is just a few lines of code that fix important issues.
Have a look, please! + #168, #156

[valq7711]

import mod
class Bar(mod.Foo):  # atom is ast.Dot without name attr, so parent = atom.name = undefined
    def __init__(self):
        mod.Foo.__init__(self)  
        ...