lua,crossref,docx - warn when crossref is empty

Author: cscheid

news/changelog-1.6.md

@@ -52,6 +52,10 @@ All changes included in 1.6:
 - ([#10212](https://github.com/quarto-dev/quarto-cli/issues/10212)): Move Pandoc variables to the function declaration for the default template.
 - ([#10438](https://github.com/quarto-dev/quarto-cli/issues/10438)): Ensure Pandoc doesn't emit its own crossref environments for table elements.
 
+## `docx` Format
+
+- ([#10401](https://github.com/quarto-dev/quarto-cli/issues/10401)): Fix crash when `docx` format is used with an empty crossref environment.
+
 ## `latex` and `pdf` Format
 
 - ([#10291](https://github.com/quarto-dev/quarto-cli/issues/10291)): Several improvement regarding Quarto LaTeX engine behavior for missing hyphenation log message:

src/resources/filters/customnodes/floatreftarget.lua

@@ -676,6 +676,10 @@ end, function(float)
   local row = pandoc.List()
   local cell = pandoc.Div({})
   cell.attr = pandoc.Attr(float.identifier, float.classes or {}, float.attributes or {})
+  if float.content == nil then
+    warn("FloatRefTarget with no content: " .. float.identifier)
+    return pandoc.Div({})
+  end
   local c = float.content.content or float.content
   if pandoc.utils.type(c) == "Block" then
     cell.content:insert(c)

tests/docs/smoke-all/2024/10/17/issue-10401.qmd

@@ -0,0 +1,9 @@
+---
+title: test
+format: docx
+---
+
+
+::: {#tbl-t2}
+
+:::