code: def find_minimum_spanning_forest(graph):
      
      msf = []
  
      if graph.num_nodes() == 0:
          return msf
      if graph.num_edges() == 0:
          return msf
  
      connected_components = get_connected_components_as_subgraphs(graph)
      for subgraph in connected_components:
          edge_list = kruskal_mst(subgraph)
          msf.append(edge_list)
  
      return msf
docs: Calculates the minimum spanning forest of a disconnected graph.
      Returns a list of lists, each containing the edges that define that tree.
      Returns an empty list for an empty graph.