Fix gotcha when defining new provider views

UI should show the key if label is missing

tailbone/views/poser/views.py

@@ -284,7 +284,7 @@ class PoserViewView(PoserMasterView):
         for topkey, topgroup in six.iteritems(view_settings):
             for key in list(topgroup):
                 settings = topgroup[key]
-                settings = [(key, setting['label'])
+                settings = [(key, setting.get('label', key))
                             for key, setting in six.iteritems(settings)]
                 settings.sort(key=lambda itm: itm[1])
                 topgroup[key] = settings