code: def test_laplacian_centrality_null_graph():
      G = nx.Graph()
      with pytest.raises(nx.NetworkXPointlessConcept):
          d = nx.laplacian_centrality(G, normalized=False)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_laplacian_centrality.py
imports: import pytest
  import networkx
label_desc: Use image node_id 1 for calling a global function with example usage: test_laplacian_centrality_null_graph() without return types