DictConfig.get('missing') inconsistent with python dict.get('missing')

[Jasha10]

This issue describes an inconsistency between DictConfig and python's standard dict:

{"a": 123}.get("b")  # returns None
OmegaConf.create({"a": 123}).get("b")  # currently throws a `ConfigKeyError`

The issue will be resolved in a pull request coming soon, so that DictConfig.get returns None if key is not found.

[omry]

Thanks.
Can you pull out the fix into it's own pull request? It can have a minimal test that can later be integrated into the more systemic test that discovered it.