[python-package] fix mypy error about eval result tuples #6105
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Contributes to #3756.
Contributes to #3867.
Resolves the following error from mypy:
That's raised in code that works with eval result tuples, which can be either 4 or 5 elements. Per the discussion in python/mypy#1178,
mypy
can't use branches likeif len(tup)
to figure out which element of a union type it must be working with.