Set device to None when user==device in astdb

app/app.py

@@ -699,7 +699,7 @@ class UsersDevices(Resource):
     data = {}
     for user in app.cache['ustates']:
       device = await getUserDevice(user)
-      if device in NONEs:
+      if ((device in NONEs) or (device == user)):
         device = None
       data[user]=device
     return successReply(data)