Exception when a type hint is a torch.tensor

Take the following script saved in bug.py:

import torch

def no_likey(input: torch.tensor):
    pass

Now execute pdoc --html bug.py. An exception is raised:

Traceback (most recent call last):
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 158, in _render_template
    return t.render(**config).strip()
  File "c:\myproject\venv\lib\site-packages\mako\template.py", line 473, in render
    return runtime._render(self, self.callable_, args, data)
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 878, in _render
    _render_context(
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 920, in _render_context
    _exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 947, in _exec_template
    callable_(context, *args, **kwargs)
  File "c:/myproject/venv/lib/site-packages/pdoc/templates/html.mako", line 429, in render_body
    ${show_module(module)}
  File "c:/myproject/venv/lib/site-packages/pdoc/templates/html.mako", line 0, in show_module

  File "c:/myproject/venv/lib/site-packages/pdoc/templates/html.mako", line 168, in render_show_module
    ${show_func(f)}
  File "c:/myproject/venv/lib/site-packages/pdoc/templates/html.mako", line 109, in show_func
    params = ', '.join(f.params(annotate=show_type_annotations, link=link))
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1340, in params
    return self._params(self, annotate=annotate, link=link, module=self.module)
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1424, in _params
    annotation = _formatannotation(p.annotation).replace(' ', '\N{NBSP}')
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1215, in _formatannotation
    if module.startswith('nptyping'):  # GH-231
AttributeError: 'NoneType' object has no attribute 'startswith'

Traceback (most recent call last):
  File "c:\program files\python38\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\program files\python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "c:\myproject\venv\Scripts\pdoc3.exe\__main__.py", line 7, in <module>
  File "c:\myproject\venv\lib\site-packages\pdoc\cli.py", line 572, in main
    recursive_write_files(module, ext='.html', **template_config)
  File "c:\myproject\venv\lib\site-packages\pdoc\cli.py", line 344, in recursive_write_files
    f.write(m.html(**kwargs))
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 832, in html
    html = _render_template('/html.mako', module=self, **kwargs)
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 158, in _render_template
    return t.render(**config).strip()
  File "c:\myproject\venv\lib\site-packages\mako\template.py", line 473, in render
    return runtime._render(self, self.callable_, args, data)
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 878, in _render
    _render_context(
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 920, in _render_context
    _exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
  File "c:\myproject\venv\lib\site-packages\mako\runtime.py", line 947, in _exec_template
    callable_(context, *args, **kwargs)
  File "_html_mako", line 143, in render_body
  File "_html_mako", line 44, in show_module
  File "_html_mako", line 414, in render_show_module
  File "_html_mako", line 329, in show_func
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1340, in params
    return self._params(self, annotate=annotate, link=link, module=self.module)
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1424, in _params
    annotation = _formatannotation(p.annotation).replace(' ', '\N{NBSP}')
  File "c:\myproject\venv\lib\site-packages\pdoc\__init__.py", line 1215, in _formatannotation
    if module.startswith('nptyping'):  # GH-231
AttributeError: 'NoneType' object has no attribute 'startswith'

Additional info

pdoc3==0.9.2
Python 3.8.10
Windows 10

Reproduce the failure with the issue's bug.py example by running pdoc --html bug.py. Start in pdoc/__init__.py at _formatannotation, where the traceback shows the failure, and verify that generation completes and renders the torch.tensor annotation without an exception.