ycb_scikit-learn_pr13779

what a new run launched now would send

Voting estimator will fail at fit if weights are passed and an estimator is None
Because we don't check for an estimator to be `None` in `sample_weight` support, `fit` is failing`.

```python
    X, y = load_iris(return_X_y=True)
    voter = VotingClassifier(
        estimators=[('lr', LogisticRegression()),
                    ('rf', RandomForestClassifier())]
    )
    voter.fit(X, y, sample_weight=np.ones(y.shape))
    voter.set_params(lr=None)
    voter.fit(X, y, sample_weight=np.ones(y.shape))
```

```
AttributeError: 'NoneType' object has no attribute 'fit'
```

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