Regression: In 63.0, SVG files with <symbol> tags fail to render

[nnsee]

Hello!

Example SVG:

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 100" width="200" height="100">
  <symbol id="star" viewBox="0 0 24 24">
    <polygon points="12,2 15,9 22,9 16,14 18,21 12,17 6,21 8,14 2,9 9,9" fill="gold" />
  </symbol>

  <use href="#star" x="80" y="10" width="50" height="50" />
</svg>

In v63.0, attempting to render this SVG fails.

$ weasyprint-dev test.svg out.pdf
ERROR: Failed to load inline SVG: 'SVG' object has no attribute 'symbols'

A bisect narrows this down to commit d566245. Reverting this commit allows the SVG to be rendered again.

[liZe]

Thanks a lot for the report and the short sample, that was really easy to reproduce. It should be fixed now!