Intervention Center error on person view without a term

[Douglas Cerna]

Steps to reproduce:

1. Start with a fresh database
2. Log in as manager
3. Create a person
4. Go to the person's index view
5. Hit the 'Intervention Center' button

You'll get:

Server Error

An internal server error has occurred. This most likely means that you have found a bug in SchoolTool. Please report it on the issue tracker.

Exception

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

  File "/usr/lib/python2.5/site-packages/zope/publisher/publish.py", line 131, in publish
  obj = request.traverse(obj)
File "/usr/lib/python2.5/site-packages/zope/publisher/browser.py", line 542, in traverse
  ob = super(BrowserRequest, self).traverse(obj)
File "/usr/lib/python2.5/site-packages/zope/publisher/http.py", line 456, in traverse
  ob = super(HTTPRequest, self).traverse(obj)
File "/usr/lib/python2.5/site-packages/zope/publisher/base.py", line 261, in traverse
  obj = publication.traverseName(self, obj, entry_name)
File "/usr/lib/python2.5/site-packages/zope/app/publication/zopepublication.py", line 197, in traverseName
  ob2 = adapter.publishTraverse(request, nm)
File "/usr/lib/python2.5/site-packages/schooltool/traverser/traverser.py", line 48, in publishTraverse
  return named_traverser.publishTraverse(request, name)
File "/usr/lib/python2.5/site-packages/schooltool/traverser/traverser.py", line 82, in publishTraverse
  return self._traverse(request, name)
File "/usr/lib/python2.5/site-packages/schooltool/intervention/intervention.py", line 367, in _traverse
  interventionStudent = getInterventionStudent(self.context.__name__)
File "/usr/lib/python2.5/site-packages/schooltool/intervention/intervention.py", line 329, in getInterventionStudent
  interventionSchoolYear = getInterventionSchoolYear(schoolYearId)
File "/usr/lib/python2.5/site-packages/schooltool/intervention/intervention.py", line 313, in getInterventionSchoolYear
  schoolyear = ISchoolYear(term)