better faulty encoding detection

tests/test_label_timeouts.py

@@ -104,6 +104,8 @@ class LabelTimeoutTests(unittest.TestCase):
                 patch.object(labels, "wait", side_effect=wait), redirect_stdout(output):
             result = labels.run(self.workspace, [], client=self.client, sleep=lambda _: None)
         self.assertEqual(result, ExitCode.SUCCESS)
+        self.assertIn("Label detection progress: 0/1 copy groups completed.", output.getvalue())
+        self.assertIn("Label detection progress: 1/1 copy groups completed.", output.getvalue())
         self.assertIn("1 copies outstanding", output.getvalue())
         self.assertIn("Copie01_01.jpg, attempt 1/3", output.getvalue())
         self.assertIn("elapsed for image", output.getvalue())