[Serialization] Return a nullptr instead of crashing #86153
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We got LLDB crash logs where `importer` is dereferenced. In the same crash log the parent frame correctly checks for nullptr, so this would fix the immediate crash. In LLDB it is not guaranteed that a ClangImporter is installed at all times. Ideally this function should be converted to return `llvm::Expected<ModuleDecl &>`. rdar://166224928
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We got LLDB crash logs where
importeris dereferenced. In the same crash log the parent frame correctly checks for nullptr, so this would fix the immediate crash. In LLDB it is not guaranteed that a ClangImporter is installed at all times.rdar://166224928