Skip generated symbols without a module path

[natesute]

Importing a class produced by collections.namedtuple can make textDocument/documentSymbol fail with TypeError when Jedi supplies generated members whose module_path is None.

Skip those members before constructing a Path. The imported class and the document's own symbols retain their locations. Regression coverage exercises both values of all_scopes and include_import_symbols with a real relative import.

Fixes #635.

Validation: two regression cases fail before the fix and two controls pass. The symbols, definitions and type-definition suites pass after the fix (19 passed, 1 platform-specific test skipped). Ruff 0.9.4 lint and formatting checks pass for both changed files.