TypeError: argument of type '_SentinelObject' is not iterable (unittest.mock)

[bryant-finney]

Problem Description

pdoc fails to generate API documentation for the unittest.mock module.

Steps to reproduce the behavior:

pdoc --output-directory /tmp/docs unittest.mock

Traceback (most recent call last):
  File "/private/tmp/pdoc/.venv/bin/pdoc", line 8, in <module>
    ...
  File "/Users/bf/.pyenv/versions/3.13.0/lib/python3.13/functools.py", line 1037, in __get__
    val = self.func(instance)
  File "/private/tmp/pdoc/.venv/lib/python3.13/site-packages/pdoc/doc.py", line 259, in members
    taken_from = self._taken_from(name, obj)
  File "/private/tmp/pdoc/.venv/lib/python3.13/site-packages/pdoc/doc.py", line 448, in _taken_from
    if mod and qual and "<locals>" not in qual:
                        ^^^^^^^^^^^^^^^^^^^^^^
TypeError: argument of type '_SentinelObject' is not iterable

System Information

❯ pdoc --version
pdoc: 15.0.0
Python: 3.13.0
Platform: macOS-14.6.1-arm64-arm-64bit-Mach-O