object is not subscriptable on some inputs

[snoyberg]

I've worked this down to as minimal a repro as I could on my machine. I have the following contents in an HTML file:

<meta charset="utf-8">
<p>XXXXXXX <code>xxxxxxxx</code> into your CI environment is very
easy, there are executable versions of the tool for some of the most
common Operating Systems available
on <a href="https://github.com/fpco/cache-s3/releases">github release
page</a> and examples on how to automate its downloading is described
in <a href="https://github.com/fpco/cache-s3#downloading-the-executable">Downloading
the executable</a> section. If you are looking for some examples on
how to implement your CI build script, <a href="/">.avis.yml</a></p>

When I run WeasyPrint on this (version 0.42.2), I get the following output:

Traceback (most recent call last):
  File "/usr/local/bin/weasyprint", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/site-packages/weasyprint/__main__.py", line 177, in main
    getattr(html, 'write_' + format_)(output, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/__init__.py", line 182, in write_pdf
    font_config=font_config).write_pdf(
  File "/usr/local/lib/python3.6/site-packages/weasyprint/__init__.py", line 143, in render
    font_config)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/document.py", line 326, in _render
    [Page(p, enable_hinting) for p in page_boxes],
  File "/usr/local/lib/python3.6/site-packages/weasyprint/document.py", line 326, in <listcomp>
    [Page(p, enable_hinting) for p in page_boxes],
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/__init__.py", line 55, in layout_document
    context, root_box, html, cascaded_styles, computed_styles))
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/pages.py", line 601, in make_all_pages
    context, root_box, page_type, resume_at, page_number)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/pages.py", line 520, in make_page
    positioned_boxes, positioned_boxes, adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 83, in block_level_layout
    adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 111, in block_box_layout
    page_is_empty, absolute_boxes, fixed_boxes, adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 638, in block_container_layout
    adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 83, in block_level_layout
    adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 111, in block_box_layout
    page_is_empty, absolute_boxes, fixed_boxes, adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 638, in block_container_layout
    adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 83, in block_level_layout
    adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 111, in block_box_layout
    page_is_empty, absolute_boxes, fixed_boxes, adjoining_margins)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/blocks.py", line 510, in block_container_layout
    for line, resume_at in lines_iterator:
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/inlines.py", line 51, in iter_line_boxes
    device_size, absolute_boxes, fixed_boxes, first_letter_style)
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/inlines.py", line 108, in get_next_linebox
    waiting_floats, line_children=[])
  File "/usr/local/lib/python3.6/site-packages/weasyprint/layout/inlines.py", line 839, in split_inline_box
    child_resume_at[0] + current_skip,
TypeError: 'NoneType' object is not subscriptable

I'm running this on an OS X machine, and am happy to provide any further information that may be relevant.

Side note: thank you very much for this project, it's by far the best I've seen at respecting CSS print rules, which has been invaluable (and way nicer than using XSLFO).

[Tontyna]

Duplicate of #580, fixed in 0.42.3

[snoyberg]

Thank you for the quick response! I can confirm that this fixes it for me.