[Distributed] Harden typechecker against completely empty DAS types #66695
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When implementing a distributed actor system protocol and the implementation is "completely empty" we may run into null pointers when trying to look up ad hoc requirements.
Solution: The safe thing to do here is to bail out from lookups when lookups for ad-hoc requirements are made on null types.
Resolves #66548
Resolves rdar://110708278