500 error loading /list_plugins

[thaeli]

Running master branch, out of the box:

500 Internal Server Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

Traceback (most recent call last):
  File "/app/env/lib/python3.4/site-packages/cherrypy/_cprequest.py", line 631, in respond
    self._do_respond(path_info)
  File "/app/env/lib/python3.4/site-packages/cherrypy/_cprequest.py", line 690, in _do_respond
    response.body = self.handler()
  File "/app/env/lib/python3.4/site-packages/cherrypy/lib/encoding.py", line 221, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/app/env/lib/python3.4/site-packages/cherrypy/_cpdispatch.py", line 60, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/app/sideboard/lib/_cp.py", line 162, in renderer
    output = method(self, *args, **kwargs)
  File "/app/sideboard/server.py", line 75, in list_plugins
    plugin_info[plugin]['paths'].append(path)
KeyError: 'sideboard'