No transform pipeline fail execution

[Ivanidzo4ka]

`
public class Data
{
[ColumnName("Features")]
[VectorType(2)]
public float[] Features;

        [ColumnName("Label")]
        public float Label;
    }

    public class Prediction
    {
        [ColumnName("PredictedLabel")]
        public bool PredictedLabel;
    }

    static void Train(IEnumerable<Data> data)
    {
        var pipeline = new LearningPipeline();
        pipeline.Add(CollectionDataSource.Create(data));
        pipeline.Add(new FastForestBinaryClassifier());
        var model = pipeline.Train<Data, Prediction>();
    }

    static void Main(string[] args)
    {
        var data = new Data[1];
        data[0] = new Data();
        data[0].Features = new float[] { 0.0f, 1.0f };
        data[0].Label = false;

        Train(data);
    }

will fail in model combainer.

[Ivanidzo4ka]

Address in PR #172