Cleanup: remove a useless reference to "object"

The method "object_list" does not have an argument "object",
so we were using a built-in class "object" by mistake.

Change-Id: I74687659223d31d3c3c119eee5874edff30634fd

openstackclient/api/object_store_v1.py

@@ -328,7 +328,7 @@ class APIv1(api.BaseAPI):
             headers will be a dict and all header names will be lowercase.
         """
 
-        if container is None or object is None:
+        if container is None:
             return None
 
         params['format'] = 'json'