Dataloader.py: list index out of range when `at_kyoku` is empty

[81100118]

Mortal/mortal/dataloader.py

Line 103 in d5e80bf

assert len(kyoku_rewards) >= at_kyoku[-1] + 1 # usually they are equal, unless there is no action in the last kyoku

When there is no action in a hanchan, at_kyoku will be empty, which will result in an IndexError: list index out of range.

[teble]

If in East 1 the hand ends with a Yakuman while at least one player has not taken any action, this issue occur. You can modify the code to discard this batch of data and not use it for training