Make the nooper impl even smaller!

util/abchelpers.py

@@ -7,12 +7,11 @@ def nooper(cls):
   """ Decorates a class that derives from an ABCMeta, filling in any unimplemented methods with
       no-ops.
   """
-  def empty_func(self_or_cls, *args, **kwargs):
+  def empty_func(*args, **kwargs):
+    # pylint: disable=unused-argument
     pass
 
-  empty_methods = {}
-  for method in cls.__abstractmethods__:
-    empty_methods[method] = empty_func
+  empty_methods = {m_name: empty_func for m_name in cls.__abstractmethods__}
 
   if not empty_methods:
     raise NoopIsANoopException('nooper implemented no abstract methods on %s' % cls)