KeyError: u'power_type' when registering a node using the API/CLI

[Raphaël Badin]

Here is an error seen in the log when registering a node using the CLI:

ERROR 2014-05-07 19:25:49,521 maasserver Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 114, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/decorators/vary.py", line 19, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 167, in __call__
    result = self.error_handler(e, request, meth, em_format)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 165, in __call__
    result = meth(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api_support.py", line 189, in dispatch
    return function(self, request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api.py", line 627, in new
    node = create_node(request)
  File "/usr/lib/python2.7/dist-packages/maasserver/api.py", line 542, in create_node
    if form.is_valid():
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 554, in is_valid
    valid = super(WithMACAddressesMixin, self).is_valid()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 250, in is_valid
    is_valid = super(NodeForm, self).is_valid()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 129, in is_valid
    return self.is_bound and not bool(self.errors)
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 121, in errors
    self.full_clean()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 139, in full_clean
    super(APIEditMixin, self).full_clean()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 274, in full_clean
    self._clean_form()
  File "/usr/lib/python2.7/dist-packages/django/forms/forms.py", line 300, in _clean_form
    self.cleaned_data = self.clean()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 428, in clean
    no_power_type = cleaned_data['power_type'] == ''
KeyError: u'power_type'

Looks like the cluster wasn't yet connected to the region. In any case, this is a crash so marking this bug Critical.