fix: Set proper notfound_urls_prefix option types (readthedocs#233)

* fix: Set proper `notfound_urls_prefix` option types

* feat(tests): Simplify

* chore: restore lines

* again

---------

Co-authored-by: Manuel Kaufmann <[email protected]>

Author: BoboTiG

notfound/extension.py

@@ -299,6 +299,7 @@ def setup(app):
             default_version=default_version,
         ),
         'html',
+        types=[str, type(None)],
     )
 
     app.connect('config-inited', validate_configs)

tests/test_urls.py

@@ -196,6 +196,8 @@ def test_urls_prefix_setting_none(app, status, warning):
     for chunk in chunks:
         assert chunk in content
 
+    assert "The config value `notfound_urls_prefix' has type `NoneType', defaults to `str'" not in warning.getvalue()
+    assert "build succeeded." in status.getvalue()
 
 @pytest.mark.sphinx(
     srcdir=srcdir,