Many cases of missing Optional

pyjapc!74 (diffs) highlighted that in Java it is always possible that the return type is null, instead of the declared type. https://www.codebyamir.com/blog/stop-returning-null-in-java

A concrete example is IncaConfigurator.getAccelerator (CERN private link), which either returns null or an Accelerator type. In our generated type-stubs, this should really be marked as Optional[Accelerator], but is currently simply Accelerator.

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