Fix traceback because _seen_ops is not initialised

must call the base class __init__

Author: barry-scott

git/util.py

@@ -320,10 +320,10 @@ class CallableRemoteProgress(RemoteProgress):
 
     def __init__(self, fn):
         self._callable = fn
-        
+        RemoteProgress.__init__(self)
+
     def update(self, *args, **kwargs):
         self._callable(*args, **kwargs)
-        
 
 class Actor(object):