fix: integrate feedback from review

bsb_nest/connection.py

@@ -98,11 +98,7 @@ def predict_mem_iterator(self, pre_nodes, post_nodes, cs):
             len(pre_nodes) * 8 * 2 + len(post_nodes) * 8 * 2 + len(cs) * 6 * 8 * (16 + 2)
         ) * MPI.get_size()
         n_chunks = len(cs.get_local_chunks("out"))
-        predicted_local_mem = (
-            (predicted_all_mem / n_chunks)
-            if n_chunks > 0
-            else 0.0
-        )
+        predicted_local_mem = (predicted_all_mem / n_chunks) if n_chunks > 0 else 0.0
         if predicted_local_mem > avmem / 2:
             # Iterate block-by-block
             return self.block_iterator(cs)

tests/test_nest.py

@@ -100,13 +100,15 @@ def spy(_):
         self.assertGreaterEqual(err_var, var_rate - expected_var)
 
     @patch("bsb_hdf5.connectivity_set.ConnectivitySet.get_local_chunks")
-    def test_empty_conn(self, get_content_mock):
+    def test_regression_issue_9(self, get_content_mock):
         # Override get_local_chunks to test empty connection sets
         get_content_mock.return_value = []
         cfg = get_test_config("gif_pop_psc_exp")
+        # we delete the NEST connectivity rule
         cfg.simulations["test_nest"].connection_models["gif_pop_psc_exp"].rule = None
         network = Scaffold(cfg, self.storage)
         network.compile()
+        # The simulation should run despite the absence of connections
         network.run_simulation("test_nest")
 
     def test_brunel(self):