Allow signaling issues in label verification

tests/test_label_timeouts.py

@@ -43,7 +43,7 @@ class LabelTimeoutTests(unittest.TestCase):
                 self.assertEqual(labels.main([str(self.workspace.root), *arguments]), 0)
                 run.assert_called_once_with(
                     unittest.mock.ANY, [self.workspace.root],
-                    overwrite=False, max_workers=expected,
+                    overwrite=False, marked=False, max_workers=expected,
                 )
 
     def test_selected_concurrency_controls_executor(self):