Message1120

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It can be fixed the way that the NPE doesn't occur anymore.
But, if there is no documentation string for dict (and BTW,
for other built-in types as well), an AttributeError will be
thrown. So, what should we do ? Hm, when we look at CPython,
we can see that, here too, dict for example has a very poor
documentation string. The same applies to list. Maybe we
should simply return an empty string. 

What do others think ?