SVG: crash on draw_pattern

[takesson]

I will send a sample svg privately.

Traceback (most recent call last):
  File "/usr/local/bin/weasyprint", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/weasyprint/__main__.py", line 214, in main
    html.write_pdf(output, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/__init__.py", line 180, in write_pdf
    self.render(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/document.py", line 1048, in write_pdf
    page.paint(stream, scale=scale)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/document.py", line 730, in paint
    draw_page(self._page_box, context)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 69, in draw_page
    draw_stacking_context(stream, stacking_context)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 183, in draw_stacking_context
    draw_stacking_context(stream, child_context)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 178, in draw_stacking_context
    draw_inline_level(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 959, in draw_inline_level
    draw_inline_level(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 965, in draw_inline_level
    draw_replacedbox(stream, box)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/draw.py", line 920, in draw_replacedbox
    box.replacement.draw(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/images.py", line 106, in draw
    self._svg.draw(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 333, in draw
    self.draw_node(self.tree, size('12pt'))
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 377, in draw_node
    self.draw_node(child, font_size)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 377, in draw_node
    self.draw_node(child, font_size)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 385, in draw_node
    self.fill_stroke(node, font_size)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 553, in fill_stroke
    fill_drawn = draw_gradient_or_pattern(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/defs.py", line 66, in draw_gradient_or_pattern
    return draw_pattern(svg, node, svg.patterns[name], font_size, stroke)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/defs.py", line 523, in draw_pattern
    Pattern(pattern, svg.url).draw(
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 333, in draw
    self.draw_node(self.tree, size('12pt'))
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 377, in draw_node
    self.draw_node(child, font_size)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/__init__.py", line 372, in draw_node
    TAGS[node.tag](self, node, font_size)
  File "/usr/local/lib/python3.9/site-packages/weasyprint/svg/defs.py", line 43, in use
    if tree.tag in ('svg', 'symbol'):
AttributeError: 'NoneType' object has no attribute 'tag'

[liZe]

Hello!

This exact bug is already fixed on master, but there’s another problem that we can fix too.

[liZe]

The bug is now fixed. There’s another fix for image size management that could be useful for you (cef8cf1).

[takesson]

Confirmed fixed on master.