Egor Zhdan 4a6bc77f7e [cxx-interop] Do not try to print empty namespaces in module interfaces ...

Clang sometimes generates implicit empty namespaces with no source location. We should not crash while trying to print them.

```
Assertion failed: (LHS.isValid() && RHS.isValid() && "Passed invalid source location!"), function isBeforeInTranslationUnit, file SourceManager.cpp
```

rdar://118534222

2023-12-22 15:32:05 +00:00

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