BisectingKMeansClusteringAlgorithm document assignment bug

I was running BisectingKMeansClusteringAlgorithm on some documents and saw that, contrary to the expected, it did not returned hard clusterings, i.e., the same document appeared in multiple clusters. I looked at the code and figured out that the problem was likely due to a bug in line 442, where starts the block:

if (it < iterations - 1)
{
    previousResult = result;
    result = Lists.newArrayList();
    for (int i = 0; i < partitions; i++)
    {
        result.add(new IntArrayList(selected.columns()));
    }
}

This condition caused that the result list is not initialized anew in the last iteration, so that the last iteration adds elements to the partitions of the iteration before it. I removed the "if" (so that the code inside the if executed for all iterations) and the algorithm started behaving as expected.