Update test_strongly_connected.py

Author: kazuki0824

tests/digraph/test_strongly_connected.py

@@ -158,7 +158,6 @@ def test_condensation_with_sccs_argument(self):
         sccs = rustworkx.strongly_connected_components(self.graph)
         # Call condensation with explicit sccs argument
         condensed_graph = rustworkx.condensation(self.graph, sccs=sccs)
-        node_map = condensed_graph.attrs["node_map"]
 
         # Check the number of nodes (should match SCC count)
         self.assertEqual(len(condensed_graph.node_indices()), len(sccs))