mercurial/bundle2.py

--- a/mercurial/bundle2.py	Wed Jun 21 02:20:34 2017 +0530
+++ b/mercurial/bundle2.py	Tue Jun 20 16:33:13 2017 -0700
@@ -341,7 +341,7 @@
         msg = ['bundle2-input-bundle:']
         if unbundler.params:
             msg.append(' %i params')
-        if op.gettransaction is None:
+        if op.gettransaction is None or op.gettransaction is _notransaction:
             msg.append(' no-transaction')
         else:
             msg.append(' with-transaction')