--- a/hgext3rd/topic/__init__.py Fri Jul 12 08:16:30 2019 -0700
+++ b/hgext3rd/topic/__init__.py Fri Jul 12 08:17:25 2019 -0700
@@ -964,7 +964,7 @@
# to not be so invasive.
del fixedextra['amend_source']
ui.debug('changing topic of %s from %s to %s\n' % (
- c, oldtopic, newtopic))
+ c, oldtopic or '<none>', newtopic or '<none>'))
ui.debug('fixedextra: %r\n' % fixedextra)
# While changing topic of set of linear commits, make sure that
# we base our commits on new parent rather than old parent which