Empty title of a resource is not handled properly in RESTive views

Traceback (most recent call last):
  File "/home/ignas/src/schooltool/Zope3/src/zope/publisher/publish.py", line
138, in publish
    result = publication.callObject(request, object)
  File "/home/ignas/src/schooltool/Zope3/src/zope/app/publication/http.py", line
73, in callObject
    return mapply(ob, request.getPositionalArguments(), request)
  File "/home/ignas/src/schooltool/Zope3/src/zope/publisher/publish.py", line
113, in mapply
    return debug_call(object, args)
  File "/home/ignas/src/schooltool/Zope3/src/zope/publisher/publish.py", line
119, in debug_call
    return object(*args)
  File "/home/ignas/src/schooltool/src/schooltool/app/rest/app.py", line 104, in
POST
    return self.create()
  File "/home/ignas/src/schooltool/src/schooltool/app/rest/app.py", line 114, in
create
    self.add(item)
  File "/home/ignas/src/schooltool/src/schooltool/app/rest/app.py", line 100, in add
    name = chooser.chooseName(None, obj)
  File "/home/ignas/src/schooltool/src/schooltool/app/app.py", line 139, in
chooseName
    self.checkName(n, obj)
  File "/home/ignas/src/schooltool/Zope3/src/zope/app/container/contained.py",
line 705, in checkName
    raise UserError(
UserError: An empty name was provided. Names cannot be empty.