Catch ValueError while importing optuna-fast-fanova

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What does this implement/fix? Explain your changes.

As reported optuna/optuna-fast-fanova#6, ValueError may be raised.

/usr/lib/python3.7/importlib/_bootstrap.py:219: RuntimeWarning: sklearn.tree._criterion.Criterion size changed, may indicate binary incompatibility. Expected 328 from C header, got 352 from PyObject
return f(*args, **kwds)
ValueError Traceback (most recent call last)
in ()
1 import optuna
----> 2 from optuna_fast_fanova import FanovaImportanceEvaluator
3
4
5 def objective(trial):

2 frames
/usr/local/lib/python3.7/dist-packages/optuna_fast_fanova/_fanova.pyx in init optuna_fast_fanova._fanova()

ValueError: sklearn.tree._criterion.ClassificationCriterion size changed, may indicate binary incompatibility. Expected 1168 from C header, got 368 from PyObject