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Allow None in keys for partial dimension overlap #830
We allow dimensions with partial overlaps in their dimensions to be displayed together. The code will internally pad any dimension keys that need it with Nones so that the overall object has a consistent set of keys that it can be indexed by. However since NdMappings check that all dimension values must be in the list of Dimension.values the None padding will raise issues. This PR means that None is always allowed as a dimension value.
Although this PR can't be merged right now due to conflicts, I'm happy to discuss this proposal again now that