Error list index out of range AND max() arg is an empty sequence

[sankerust]

General model error

Error message

  File "D:\Projects\hastic-server\analytics\analytic_unit_manager.py", line 35, in handle_analytic_task
    result_payload = await worker.do_learn(payload['segments'], data, payload['cache'])
  File "D:\Projects\hastic-server\analytics\analytic_unit_worker.py", line 19, in do_learn
    return await self.detector.train(data, segments, cache)
  File "D:\Projects\hastic-server\analytics\detectors\pattern_detector.py", line 40, in train
    new_cache = self.model.fit(dataframe, segments, cache)
  File "D:\Projects\hastic-server\analytics\models\model.py", line 34, in fit
    self.do_fit(dataframe, segments)
  File "D:\Projects\hastic-server\analytics\models\general_model.py", line 50, in do_fit
    self.model_gen = utils.get_av_model(patterns_list)
  File "D:\Projects\hastic-server\analytics\utils\__init__.py", line 215, in get_av_model
    if len(patterns_list[1]) != x:
IndexError: list index out of range
'
2018-10-26 20:47:42,559 [Analytics] [INFO ]  Command is OK
2018-10-26 20:47:42,610 [Analytics] [ERROR]  handle_analytic_task exception: 'Traceback (most recent call last):
  File "D:\Projects\hastic-server\analytics\analytic_unit_manager.py", line 37, in handle_analytic_task
    result_payload = await worker.do_predict(data, payload['cache'])
  File "D:\Projects\hastic-server\analytics\analytic_unit_worker.py", line 22, in do_predict
    return await self.detector.predict(data, cache)
  File "D:\Projects\hastic-server\analytics\detectors\pattern_detector.py", line 47, in predict
    predicted = self.model.predict(dataframe, cache)
  File "D:\Projects\hastic-server\analytics\models\model.py", line 41, in predict
    result = self.do_predict(dataframe)
  File "D:\Projects\hastic-server\analytics\models\general_model.py", line 96, in do_predict
    y = max(pat_data)
ValueError: max() arg is an empty sequence```

[jonyrock]

@VargBurz Explanation why it happened necessary for closing task. Also tests.

[VargBurz]

https://github.com/hastic/hastic-server/issues/191

[VargBurz]

Fixed in https://github.com/hastic/hastic-server/pull/217