[Misc]Suppress irrelevant exception stack trace information when CUDA… (#11438)

Co-authored-by: shiquan <shiquan>

vllm/entrypoints/llm.py

@@ -233,7 +233,8 @@ class LLM:
         self.request_counter = Counter()
 
     def __del__(self):
-        if self.llm_engine and hasattr(self.llm_engine, "shutdown"):
+        if hasattr(self, 'llm_engine') and self.llm_engine and hasattr(
+                self.llm_engine, "shutdown"):
             self.llm_engine.shutdown()
 
     @staticmethod