Merge NVIDIA#51: Bug fix - avoic str concat with None when logging user_intent

Author: drazvan

nemoguardrails/actions/llm/generation.py

@@ -269,7 +269,10 @@ async def generate_user_intent(self, events: List[dict]):
             if user_intent and user_intent.startswith("user "):
                 user_intent = user_intent[5:]
 
-            log.info("Canonical form for user intent: %s", user_intent)
+            log.info(
+                "Canonical form for user intent: "
+                + (user_intent if user_intent else "None")
+            )
 
             if user_intent is None:
                 return ActionResult(