py3: assign e so it survives outside the scope

IPython/parallel/tests/test_view.py

@@ -636,8 +636,8 b' class TestView(ClusterTestCase, ParametricTestCase):'
         ar = self.client.get_result(msg_ids)
         try:
             ar.get()
-        except error.CompositeError as e:
-            pass
+        except error.CompositeError as _e:
+            e = _e
         else:
             self.fail("Should have raised CompositeError")