AttributeError: 'NoneType' object has no attribute 'toordinal'

[admin]

How to Reproduce

While doing a GET operation on /backlog/Sprint Backlog, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'bscope': u'sss', 'name': u'Sprint Backlog', 'scope': None}

System Information

Trac	0.11.5
Python	2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)]
setuptools	0.6c9
SQLite	3.3.4
pysqlite	2.3.2
Genshi	0.5.1
Agilo	1.2.1-pro
Subversion	1.5.6 (r36142)

Python Traceback

Traceback (most recent call last):
  File "C:\Program Files\Agilo\lib\site-packages\trac-0.11.5-py2.5.egg\trac\web\main.py", line 444, in _dispatch_request
    dispatcher.dispatch(req)
  File "C:\Program Files\Agilo\lib\site-packages\trac-0.11.5-py2.5.egg\trac\web\main.py", line 205, in dispatch
    resp = chosen_handler.process_request(req)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\api\view.py", line 155, in process_request
    return self._call_filters_and_handler(req, handler)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\api\view.py", line 143, in _call_filters_and_handler
    data = handler(req) or {}
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\scrum\backlog\new_webui.py", line 166, in do_get
    chart = self._get_and_prepare_burndown_chart_if_neccessary(req, backlog)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\scrum\backlog\new_webui.py", line 148, in _get_and_prepare_burndown_chart_if_neccessary
    widget = get_widget(ChartType.BURNDOWN, sprint_name=sprint.name)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\charts\chart_generator.py", line 135, in get_chartwidget
    new_widget  = self._get_widget(name, kwargs, use_cache)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\charts\chart_generator.py", line 110, in _get_widget
    new_widget = generator.generate_widget(name, **kwargs)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\scrum\backlog\charts.py", line 62, in generate_widget
    burndown_widget.populate_with_sprint_data(sprint_name)
  File "C:\Program Files\Agilo\lib\site-packages\binary_agilo-1.2.1_pro-py2.5.egg\agilo\scrum\backlog\charts.py", line 292, in populate_with_sprint_data
    start_sprint = sprint.start.toordinal()
AttributeError: 'NoneType' object has no attribute 'toordinal'

[Remy Blank]

Duplicate of #9189.