fix: add exception handling for logger retrieval in cold storage object key generation

- Wrap get_active_custom_logger_for_callback_name call in try-except block
- Gracefully handle cases where logger instance cannot be retrieved
- Fall back to empty s3_path when logger lookup fails
- Prevents crashes when cold storage logger is misconfigured or unavailable

Author: hula-la

litellm/litellm_core_utils/litellm_logging.py

@@ -4161,10 +4161,14 @@ def _generate_cold_storage_object_key(
             # Get the actual s3_path from the configured cold storage logger instance
             s3_path = ""  # default value
 
-            # Get the actual logger instance from the logger name
-            custom_logger = litellm.logging_callback_manager.get_active_custom_logger_for_callback_name(configured_cold_storage_logger)
-            if custom_logger and hasattr(custom_logger, 's3_path') and custom_logger.s3_path:
-                s3_path = custom_logger.s3_path
+            # Try to get the actual logger instance from the logger name
+            try:
+                custom_logger = litellm.logging_callback_manager.get_active_custom_logger_for_callback_name(configured_cold_storage_logger)
+                if custom_logger and hasattr(custom_logger, 's3_path') and custom_logger.s3_path:
+                    s3_path = custom_logger.s3_path
+            except Exception:
+                # If any error occurs in getting the logger instance, use default empty s3_path
+                pass
 
             s3_object_key = get_s3_object_key(
                 s3_path=s3_path,  # Use actual s3_path from logger configuration