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Chaining_null-conditional_on_a__when_.kt

I already asked the question in <#C0922A726|general> yesterday, but I simplified it now and I think this is more suited channel...

`Raw` is actually an RxJava `Single` type, `x().y().z()` are a chain of Rx operators converting the `Single` into an `Observable` and doing other stuff.

`xyz()` is actually an empty `Observable`.

But this is more of a language question, it has nothing to do with Rx