Cosmos: projection of empty owned entity lists returns null instead of empty

[roji]

See the various association tests referencing this issue.

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• Cosmos: Owned entity type collection gets wrongly projected out as null when inside an anonymous object projection #31696

[JoasE]

During projection binding, IncludeCollection is invoked which will enumerate a select over a projection binding lambda for the collection type. If tracking is enabled, change tracking will initialize the collection if not set during the enumeration. If tracking is not enabled, a fixup is invoked which will initialize the collection if not set. If no items are in the list, no enumeration is done and no fixup or change tracking code is ran, thus the collection will never be initialized.

Simple fix is always initialize collection in IncludeCollection if value is not null

[JoasE]

@roji This seemed like a small thing so I went ahead and fixed in: #37971