[SwiftASTContext] Add missing null check in ImportType #986
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Add a missing null check in ImportType. Without this, a program that does not contain an N_AST reference pointing back to a swiftmodule it uses can cause lldb to crash. rdar://60734897
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Add a missing null check in ImportType. Without this, a program that
does not contain an N_AST reference pointing back to a swiftmodule it
uses can cause lldb to crash.
rdar://60734897