[clang-tools-extra] [clang-tidy] Fix crashes when analyzing unknown exceptions in bugprone-exception-escape (PR #218067)

[Zeyi Xu via cfe-commits]

================
@@ -362,6 +362,8 @@ ExceptionAnalyzer::ExceptionInfo::filterByCatch(const Type 
*HandlerTy,
   SmallVector<const Type *, 8> TypesToDelete;
   for (const auto &ThrownException : ThrownExceptions) {
     const Type *ExceptionTy = ThrownException.getFirst();
+    if (!ExceptionTy)
+      continue;
----------------
zeyi2 wrote:

I think it still works as expected, and this seems already covered in the 
existing test cases.

https://github.com/llvm/llvm-project/pull/218067
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