Attempting to create a VM on a read-only cluster throws exception

[tschuy]

From Nate Aune

When I try to add a new VM, and haven't specified a username/password for the Ganeti cluster, I get the following error:
It should probably prevent me from trying to create a new VM, if I haven't filled out the username/password for the cluster.

Environment:

Request Method: POST
Request URL: http://localhost:8000/vm/add

Django Version: 1.4.8
Python Version: 2.7.3
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.formtools',
 'django.contrib.messages',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.staticfiles',
 'registration',
 'ganeti_web',
 'object_permissions',
 'object_log',
 'south',
 'haystack',
 'muddle',
 'muddle.shots',
 'muddle_users',
 'include_strip_tag',
 'django_tables2')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.middleware.transaction.TransactionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'ganeti_web.middleware.PermissionDeniedMiddleware')

Traceback:
File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
1.                         response = callback(request, _callback_args, *_callback_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/views/generic/base.py" in view
2.             return self.dispatch(request, _args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
3.             return bound_func(_args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
4.                 return view_func(request, _args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
5.                 return func(self, _args2, *_kwargs2)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/views/generic.py" in dispatch
6.         return super(LoginRequiredMixin, self).dispatch(_args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/views/generic.py" in dispatch
7.             **kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/contrib/formtools/wizard/views.py" in dispatch
8.         response = super(WizardView, self).dispatch(request, _args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
9.         return handler(request, _args, *_kwargs)
   File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/contrib/formtools/wizard/views.py" in post
10.                 return self.render_done(form, **kwargs)
    File "/Users/nateaune/Dropbox/code/ganeti_webmgr/venv/lib/python2.7/site-packages/django/contrib/formtools/wizard/views.py" in render_done
11.         done_response = self.done(final_form_list, **kwargs)
    File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/forms/virtual_machine.py" in done
12.             vm = template_to_instance(template, hostname, owner)
    File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/backend/templates.py" in template_to_instance
13.                                          **kwargs)
    File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/util/client.py" in CreateInstance
14.                                  content=body)
    File "/Users/nateaune/Dropbox/code/ganeti_webmgr/ganeti_web/util/client.py" in _SendRequest
15.             raise GanetiApiError(str(r.status_code), code=r.status_code)

Exception Type: GanetiApiError at /vm/add
Exception Value: 401