🍒[5.9][Distributed] Don't diagnose declared dist member properties when importing module #66842
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Description: We previously fixed that this method should not diagnose when checking in SourceFileKind::Interface mode, but we also should skip when there is no source file at all. This fixes compilation of the distributed cluster in 5.9, since the behavior of typechecking seems to have changed slightly and we didn't enter this function in such situations previously.
Risk: Low, prevents over-zelous error diagnostics messages when importing modules
Review by: @DougGregor
Testing: CI testing; Verified the cluster compiles again after the fix manually
Original PR: #66841
Radar: rdar://111080052