message: fix for null inertias
diff: @@ -678,7 +678,7 @@ class Atol(BaseEstimator, TransformerMixin):
  self.inertias = np.array([np.max(dist_centers)/2])
  else:
  dist_centers = pairwise.pairwise_distances(self.centers)
  - np.fill_diagonal(dist_centers, np.inf)
  + dist_centers[dist_centers == 0] = np.inf
  self.inertias = np.min(dist_centers, axis=0)/2
  return self
  