This is somehow a corner case, since you probably won't encounter it unless you are switching between Toaster modes. It is a bug nonetheless, so there it goes. 

Steps to reproduce:

1. Start toaster in build (managed) mode and visit the all builds page
2. Stop toaster
3. Source the environment script
4. Start Toaster in analysis (interactive) mode 
5. If you are redirected to the no builds state, type this url in your browser

localhost:8000/toastergui/builds

The page fails to load. This is the trace:

Environment:

Request Method: GET
Request URL:
http://127.0.0.1:8000/toastergui/builds/?count=10&orderby=updated%3A-&page=
1

Django Version: 1.6
Python Version: 2.7.6
Installed Applications:
('django.contrib.staticfiles',
'django.contrib.humanize',
'orm',
'toastermain',
'south',
'bldviewer',
'toastergui',
'bldcontrol')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')


Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py"
in get_response
  114.                     response = wrapped_callback(request,
*callback_args, **callback_kwargs)
File "/home/yocto/master/bitbake/lib/toaster/toastergui/views.py" in builds
  3139.         (filter_string, search_term, ordering_string) =
_search_tuple(request, Build)
File "/home/yocto/master/bitbake/lib/toaster/toastergui/views.py" in
_search_tuple
  216.         raise BaseException("Invalid ordering model:" +
str(model) + str(invalid))

Exception Type: BaseException at /toastergui/builds/
Exception Value: Invalid ordering model:<class
'orm.models.Build'>(u'updated', ['bitbake_version', 'build_name',
'buildartifact', 'buildrequest', 'completed_on', 'cooker_log_path',
'distro', 'distro_version', 'errors_no', 'helptext_build', u'id',
'layer_version_build', 'logmessage', 'machine', 'outcome', 'package',
'project', 'started_on', 'target', 'task_build', 'timespent',
'variable_build', 'warnings_no'])