as_dict() not working with empty dict values

[eevleevs]

If you have a value that is an empty dict, it will be set as another FlatDict, that is not cast back by as_dict().

Actual:

>>> FlatDict({'a': {}}).as_dict()
{'a': <FlatDict id=140733286897024 {}>"}

Expected:

>>> FlatDict({'a': {}}).as_dict()
{'a': {}}

[CrashLaker]

same issue.
it depends on the use case but as a workaround i'm doing this

[tgh19]

I have a PR out that should fix this #57

print(FlatDict({'a': {}, 'b': []}).as_dict())
{'a': {}, 'b': []}

[jpo-tu]

The issue is a little more nuanced, turns out: #59