[Async] Apply #2307 to async code

Author: sfc-gh-fpawlowski

src/snowflake/connector/aio/_cursor.py

@@ -235,7 +235,10 @@ async def _execute_helper(
         else:
             # or detect it.
             self._is_file_transfer = get_file_transfer_type(query) is not None
-        logger.debug("is_file_transfer: %s", self._is_file_transfer is not None)
+        logger.debug(
+            "is_file_transfer: %s",
+            self._is_file_transfer if self._is_file_transfer is not None else "None",
+        )
 
         real_timeout = (
             timeout if timeout and timeout > 0 else self._connection.network_timeout