build fails with mkdocs-material > 9.0.6 #110
Description
We fixed the mkdocs-material version used to build the docs to 9.0.6 in d974bab (included via #109), to work around failing build with mkdocs-material==9.0.7 and mkdocs-material==9.0.8
Traceback (most recent call last):
File "/opt/hostedtoolcache/Python/3.10.9/x64/bin/mkdocs", line 8, in <module>
sys.exit(cli())
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/click/core.py", line 1130, in __call__
return self.main(*args, **kwargs)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/click/core.py", line 1055, in main
rv = self.invoke(ctx)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/click/core.py", line 760, in invoke
return __callback(*args, **kwargs)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/mkdocs/__main__.py", line 250, in build_command
build.build(cfg, dirty=not clean)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/mkdocs/commands/build.py", line 320, in build
_build_theme_template(template, env, files, config, nav)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/mkdocs/commands/build.py", line 118, in _build_theme_template
output = _build_template(template_name, template, files, config, nav)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/mkdocs/commands/build.py", line 97, in _build_template
output = template.render(context)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/environment.py", line 1301, in render
self.environment.handle_exception()
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/environment.py", line 936, in handle_exception
raise rewrite_traceback_stack(source=source)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/404.html", line 4, in top-level template code
{% extends "main.html" %}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/main.html", line 4, in top-level template code
{% extends "base.html" %}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/base.html", line 148, in top-level template code
{% block site_nav %}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/base.html", line 156, in block 'site_nav'
{% include "partials/nav.html" %}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/partials/nav.html", line 27, in top-level template code
{% include "partials/nav-item.html" %}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/partials/nav-item.html", line 91, in top-level template code
{{ render(nav_item, path, level) }}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/runtime.py", line 777, in _invoke
rv = self._func(*arguments)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/partials/nav-item.html", line 56, in template
{{ render(nav_item, path ~ "_" ~ loop.index, level + 1) }}
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/runtime.py", line 777, in _invoke
rv = self._func(*arguments)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/material/partials/nav-item.html", line 48, in template
<nav class="md-nav" data-md-level="{{ level }}" aria-labelledby="{{ path }}_label" aria-expanded="{{ nav_item.active | tojson }}">
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/filters.py", line 1688, in do_tojson
return htmlsafe_json_dumps(value, dumps=dumps, **kwargs)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/site-packages/jinja2/utils.py", line 658, in htmlsafe_json_dumps
dumps(obj, **kwargs)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/json/__init__.py", line 238, in dumps
**kw).encode(obj)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/json/encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/json/encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "/opt/hostedtoolcache/Python/3.10.9/x64/lib/python3.10/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type Undefined is not JSON serializable
Error: Process completed with exit code 1.