Trac 0.11 fails to display beginning of history

[Martin von Gagern]

When trying to view the first few revisions of a log, including revision 0, then trac 0.11 will die with the following traceback:

...
  File "/home/mvg/src/up/trac/genshi/trunk/genshi/template/eval.py", line 178, in evaluate
    return eval(self.code, _globals, {'__data__': data})
  File "/home/mvg/src/up/trac/0.11-stable/trac/versioncontrol/templates/revisionlog.html", line 148, in <Expression u'dateinfo(change.date)'>
    <td class="date" py:content="dateinfo(change.date)" />
  File "/home/mvg/src/up/trac/0.11-stable/trac/timeline/web_ui.py", line 236, in dateinfo
    pretty_timedelta(date),
  File "/home/mvg/src/up/trac/0.11-stable/trac/util/datefmt.py", line 73, in pretty_timedelta
    time1 = to_datetime(time1)
  File "/home/mvg/src/up/trac/0.11-stable/trac/util/datefmt.py", line 53, in to_datetime
    type(t))
TypeError: expecting datetime, int, long, float, or None; got <class 'genshi.template.eval.Undefined'>

The cause seems to be that current trunk only knows about revision "null:" but not about revisions "branchname,null:". So there is some problem with the changeset for the null revision. WIll attach a branch fixing this.