Interventions tab crashes when there are no terms set up

Fresh Data.fs, create a school year, don't add a term. Log in, hit 'Interventions'.

Exception

  TypeError: ('Could not adapt', None, <InterfaceClass schooltool.schoolyear.interfaces.ISchoolYear>)
Traceback

  File "/home/justas/.buildout/eggs/zope.publisher-3.4.6-py2.5.egg/zope/publisher/publish.py", line 130, in publish
  obj = request.traverse(obj)
File "/home/justas/.buildout/eggs/zope.publisher-3.4.6-py2.5.egg/zope/publisher/browser.py", line 513, in traverse
  ob = super(BrowserRequest, self).traverse(obj)
File "/home/justas/.buildout/eggs/zope.publisher-3.4.6-py2.5.egg/zope/publisher/http.py", line 463, in traverse
  ob = super(HTTPRequest, self).traverse(obj)
File "/home/justas/.buildout/eggs/zope.publisher-3.4.6-py2.5.egg/zope/publisher/base.py", line 263, in traverse
  obj = publication.traverseName(self, obj, entry_name)
File "/home/justas/.buildout/eggs/zope.app.publication-3.4.3-py2.5.egg/zope/app/publication/publicationtraverse.py", line 61, in traverseName
  ob2 = adapter.publishTraverse(request, nm)
File "/home/justas/src/schooltool/schooltool_bugfixes/src/schooltool/traverser/traverser.py", line 50, in publishTraverse
  return named_traverser.publishTraverse(request, name)
File "/home/justas/src/schooltool/schooltool_bugfixes/src/schooltool/traverser/traverser.py", line 84, in publishTraverse
  return self._traverse(request, name)
File "/home/justas/src/schooltool/schooltool_bugfixes/src/schooltool/traverser/traverser.py", line 123, in _traverse
  name=self.adapterName)
File "/home/justas/.buildout/eggs/zope.component-3.4.0-py2.5.egg/zope/component/_api.py", line 96, in queryAdapter
  return adapter_hook(interface, object, name, default)
File "/home/justas/.buildout/eggs/zope.app.component-3.4.1-py2.5.egg/zope/app/component/hooks.py", line 95, in adapter_hook
  return siteinfo.adapter_hook(interface, object, name, default)
File "/home/justas/src/schooltool/schooltool.intervention_trunk/src/schooltool/intervention/intervention.py", line 292, in getSchoolToolApplicationInterventionSchoolYear
  return getInterventionSchoolYear()
File "/home/justas/src/schooltool/schooltool.intervention_trunk/src/schooltool/intervention/intervention.py", line 310, in getInterventionSchoolYear
  schoolyear = ISchoolYear(term)