Figure with empty caption and cross-ref label rendered to Typst crashes main.lua

[iandol]

Bug description

With this code:

---
title: "No Caption Figure Test"
author: Jane Doe
---

Text.

![](xkcd.png){#fig-xkcd}

Text.

I get this crashlog rendering to Typst:

▷ quarto render sf.qmd -t typst -o sf.pdf
pandoc -o sf.typ
  to: typst
  standalone: true
  default-image-extension: svg
  wrap: none
  citeproc: false
  
metadata
  title: No Caption Figure Test
  author: Jane Doe
  
Error running filter /Applications/quarto/share/filters/main.lua:
/Applications/quarto/share/filters/main.lua:22303: attempt to index a nil value (local 'caption')
stack traceback:
	/Applications/quarto/share/filters/main.lua:1211: in local 'filter_fn'
	/Applications/quarto/share/filters/main.lua:613: in function </Applications/quarto/share/filters/main.lua:603>
	(...tail calls...)
	[C]: in ?
	[C]: in method 'walk'
	/Applications/quarto/share/filters/main.lua:535: in function </Applications/quarto/share/filters/main.lua:524>
	(...tail calls...)
	/Applications/quarto/share/filters/main.lua:1312: in local 'callback'
	/Applications/quarto/share/filters/main.lua:1330: in upvalue 'run_emulated_filter_chain'
	/Applications/quarto/share/filters/main.lua:1366: in function </Applications/quarto/share/filters/main.lua:1363>
stack traceback:
	/Applications/quarto/share/filters/main.lua:535: in function </Applications/quarto/share/filters/main.lua:524>
	(...tail calls...)
	/Applications/quarto/share/filters/main.lua:1312: in local 'callback'
	/Applications/quarto/share/filters/main.lua:1330: in upvalue 'run_emulated_filter_chain'
	/Applications/quarto/share/filters/main.lua:1366: in function </Applications/quarto/share/filters/main.lua:1363>

I can stop the crash by removing the cross-ref label OR adding a caption text. Render to HTML or LaTeX and it works as is.

Steps to reproduce

No response

Expected behavior

Typst output doesn't crash main.lua

Actual behavior

No document is produced

Your environment

Quarto 1.5.35 on macOS 14.4.1

Quarto check output

▷ quarto check                           
Quarto 1.5.35
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.13: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.41.0: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.5.35
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.05
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/ian/Library/TinyTeX/bin/universal-darwin
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.12.1
      Path: /Users/ian/.pyenv/versions/3.12.1/bin/python3
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

      There is an unactivated Python environment in micromamba. Did you forget to activate it?

[✓] Checking R installation...........OK
      Version: 4.4.0
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library
      knitr: (None)
      rmarkdown: (None)

      The knitr package is not available in this R installation.
      Install with install.packages("knitr")
      The rmarkdown package is not available in this R installation.
      Install with install.packages("rmarkdown")

[mcanouil]

Thanks for the report. The inline syntax does produce a crash.

Alternatively, the fenced div syntax works.

---
title: "No Caption Figure Test"
author: Jane Doe
format: typst
---

Text.

:::{#fig-xkcd}
![](xkcd.png)
:::

Text.

[cscheid]

Thanks for the report. (For our own sake, this is another side-effect of the Pandoc upstream fix that removed empty Plain nodes)