Sub-dicts with falsy value can be lost

[bmerry]

In 2.0.0:

>>> from addict import Dict
>>> a[0].x = 1
>>> print(a)
{}

This is because this line tests for key being true, for no good reason that I can see.

[mewwts]

This should now be fixed 🥇

[bmerry]

Looking at the code, I suspect a[None].x = 1 will still fail. I'm not seeing why the key is not None test is needed at all.

[mewwts]

You're right! In my head None was unhashable, but it's not. Editing....