Note that all null owned types are also returned as null

Owned Types where all fields are null are returned as null on their respective owners. If this is the desired semantic of _all null_ values, this should be marked somewhere to prevent confusion.

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#### Document Details

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* ID: d02e6748-42e0-000a-4945-42cd05a0b875
* Version Independent ID: e3effbd0-07f2-423d-4032-1722e75adb37
* Content: [Owned Entity Types - EF Core](https://docs.microsoft.com/en-us/ef/core/modeling/owned-entities)
* Content Source: [entity-framework/core/modeling/owned-entities.md](https://github.com/dotnet/EntityFramework.Docs/blob/main/entity-framework/core/modeling/owned-entities.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @AndriySvyryd
* Microsoft Alias: **avickers**