message: removed message about empty dgm
diff: @@ -21,7 +21,7 @@ Basic example
  -------------
  This example computes the Frechet mean (aka Wasserstein barycenter) between four persistence diagrams.
  -It is initialized on the 4th diagram, which is the empty diagram. It is encoded by np.array([]).
  +It is initialized on the 4th diagram.
  As the algorithm is not convex, its output depends on the initialization and is only a local minimum of the objective function.
  Initialization can be either given as an integer (in which case the i-th diagram of the list is used as initial estimate)
  or as a diagram.
  