fix: on exception print error

app.py

@@ -51,14 +51,19 @@ def call_function(tool_call, available_functions):
     }
 
 def get_model_response(messages):
-    return client.chat.completions.create(
-        model=MODEL,
-        messages=messages,
-        tools=tools,
-        temperature=0.5,
-        top_p=0.65,
-        max_tokens=4096,
-    )
+    try:
+        return client.chat.completions.create(
+            model=MODEL,
+            messages=messages,
+            tools=tools,
+            temperature=0.5,
+            top_p=0.65,
+            max_tokens=4096,
+        )
+    except Exception as e:
+        print(f"An error occurred while getting model response: {str(e)}")
+        print(messages)
+        return None
 
 def respond(message, history, system_message):
     if not hasattr(respond, 'conversation'):