fix: Don't crash on Google parameters sections found in non-function …

…docstrings

Issue mkdocstrings/python#19: mkdocstrings/python#19

src/griffe/docstrings/google.py

@@ -206,13 +206,14 @@ def _read_parameters(  # noqa: WPS231
         if annotation is None:
             _warn(docstring, line_number, f"No type or annotation for parameter '{name}'")
 
-        if warn_unknown_params and docstring.parent is not None:
-            if name not in docstring.parent.parameters:  # type: ignore[attr-defined]
-                _warn(
-                    docstring,
-                    line_number,
-                    f"Parameter '{name}' does not appear in the parent signature",
-                )
+        if warn_unknown_params:
+            with suppress(AttributeError):  # for parameters sections in non-function docstrings
+                if name not in docstring.parent.parameters:  # type: ignore[union-attr]
+                    _warn(
+                        docstring,
+                        line_number,
+                        f"Parameter '{name}' does not appear in the parent signature",
+                    )
 
         parameters.append(DocstringParameter(name=name, value=default, annotation=annotation, description=description))
 

tests/test_docstrings/test_google.py

@@ -753,6 +753,22 @@ def test_never_warn_about_unknown_other_parameters(parse_google):
     assert not warnings
 
 
+def test_unknown_params_scan_doesnt_crash_on_non_function_docstrings(parse_google):
+    """Never warn about unknown parameters in "Other parameters" sections.
+
+    Parameters:
+        parse_google: Fixture parser.
+    """
+    docstring = """
+        Parameters:
+            this (str): This.
+            that (str): That.
+    """
+
+    _, warnings = parse_google(docstring, parent=Class("c"))
+    assert not warnings
+
+
 # TODO: possible feature
 # def test_missing_parameter(parse_google):
 #     """Warn on missing parameter in docstring.