style(pool): use `pass` instead of `return` for empty methods

diff --git a/psycopg_pool/psycopg_pool/base_null_pool.py b/psycopg_pool/psycopg_pool/base_null_pool.py
index 165ffcc8678bc58988ab62cbcd838b8701896347..c75a2290dfc58cec0d3db746533864458b156b17 100644 (file)
--- a/psycopg_pool/psycopg_pool/base_null_pool.py
+++ b/psycopg_pool/psycopg_pool/base_null_pool.py
@@ -22,7 +22,7 @@ class _BaseNullConnectionPool:
     def _start_initial_tasks(self) -> None:
         # Null pools don't have background tasks to fill connections
         # or to grow/shrink.
-        return
+        pass
 
     def _maybe_grow_pool(self) -> None:
         # null pools don't grow