OmegaConf.create(None) is None != True

[asafarevich]

Describe the bug
DictConfig with None as value does not get treated as None
side note: OmegaConf.create(None) == None returns True, but itsn't a valid way to solve the problem cause that triggers flake8 and such...

To Reproduce

print(OmegaConf.create(None) is None) # returns False

Expected behavior

print(OmegaConf.create(None) is None) # returns True

Additional context

• OmegaConf version: 2.3.0
• Python version: 3.9.0
• Operating system:Ubuntu 22.04.4 LTS
• Please provide a minimal repro

from omegaconf import OmegaConf
print(OmegaConf.create(None) is None) # False

[asafarevich]

Current solution that I've found that kinda gets around the issue is

len(OmegaConf.create(None).keys()) == 0 # returns True

but this only handles DictConfig, not ListConfig