I just got exactly the same issue when trying to add my name as Author on http://trac.sagemath.org/ticket/11985

Trac detected an internal error:

TypeError: object of type 'listreverseiterator' has no len()


Python Traceback
Most recent call last:

File "/usr/local/lib/python2.7/dist-packages/Trac-1.1.2dev-py2.7.egg/trac/web/main.py", line 497, in _dispatch_request
  dispatcher.dispatch(req)
File "/usr/local/lib/python2.7/dist-packages/Trac-1.1.2dev-py2.7.egg/trac/web/main.py", line 214, in dispatch
  resp = chosen_handler.process_request(req)
File "/usr/local/lib/python2.7/dist-packages/Trac-1.1.2dev-py2.7.egg/trac/ticket/web_ui.py", line 185, in process_request
  return self._process_ticket_request(req)
File "/usr/local/lib/python2.7/dist-packages/Trac-1.1.2dev-py2.7.egg/trac/ticket/web_ui.py", line 623, in _process_ticket_request
  valid = self._validate_ticket(req, ticket, not valid) and valid
File "/usr/local/lib/python2.7/dist-packages/Trac-1.1.2dev-py2.7.egg/trac/ticket/web_ui.py", line 1321, in _validate_ticket
  for field, message in manipulator.validate_ticket(req, ticket):
File "/srv/trac/sage_trac/plugins/ticket_branch.py", line 288, in validate_ticket
  return []

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