TypeError: 'NoneType' object is not iterable

[rocketinventor]

I noticed that when using the default (demo) instance, near the end of the game, instead of playing valid moves, I get the following error: TypeError: 'NoneType' object is not iterable. This is odd, because there are still areas on the board that can be played by white (but they are not getting played). Once this happens, the client-side ui starts to put down white stones instead of black ones. These sysmptoms are very similar to #26 and #27.

"POST /prediction HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask_cors/extension.py", line 188, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask_cors/extension.py", line 188, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/ubuntu/workspace/.betago/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/ubuntu/workspace/betago/betago/model.py", line 61, in next_move
    bot_row, bot_col = self.bot.select_move('w')
TypeError: 'NoneType' object is not iterable

[macfergus]

I guess there are two separate problems here. One, passing is a perfectly valid move, so the demo server should allow the bot to pass, and the client should handle that as well.

Two, the bot is passing when we wouldn't expect it to. Probably this is another example of game state getting out of sync (as referenced in #27), but it's also possible that the bot just has some dumb passing logic.

[rocketinventor]

I think that you are right about the two problems. ~~However, I think that #26 might (also) be the cause if there are stones/areas that the user captured but the server isn't recognizing.~~

ATM, there is no mechanism for either the user, or the server to pass :disappointed: