Drop usage.rst doctest for empty parse; assert len==0 in test_len instead

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: derek73

docs/usage.rst

@@ -78,14 +78,6 @@ Empty or unparsable input does not raise an error; it produces a name whose
 attributes are all empty. Check ``len(name) == 0`` (or ``str(name) == ''``)
 to detect that nothing was parsed.
 
-.. doctest::
-
-    >>> name = HumanName("")
-    >>> len(name)
-    0
-    >>> str(name)
-    ''
-
 
 Capitalization Support
 ----------------------

tests/test_python_api.py

@@ -36,6 +36,9 @@ def test_len(self) -> None:
         self.m(len(hn), 5, hn)
         hn = HumanName("John Doe")
         self.m(len(hn), 2, hn)
+        # empty input parses to an all-empty name; len == 0 is the
+        # documented emptiness check (see usage.rst)
+        self.assertEqual(len(HumanName("")), 0)
 
     @pytest.mark.skipif(not dill, reason="requires python-dill module to test pickling")
     def test_config_pickle(self) -> None: