Merge pull request #10360 from quarto-dev/bugfix/10358

floats - ensure caption_long exists and has content

Author: cscheid

src/resources/filters/customnodes/floatreftarget.lua

@@ -202,7 +202,15 @@ function decorate_caption_with_crossref(float)
     internal_error()
     -- luacov: enable
   end
-  local caption_content = (float.caption_long and float.caption_long.content) or float.caption_long or pandoc.Inlines({})
+  if float.caption_long and float.caption_long.content == nil then
+    local error_msg = "FloatRefTarget has caption_long field of type " .. tostring(float.caption_long.t) .. " which doesn't support content: " .. float.identifier
+    error(error_msg)
+    return {}
+  end
+  if float.caption_long == nil then
+    float.caption_long = pandoc.Plain({})
+  end
+  local caption_content = float.caption_long.content
 
   if float.parent_id then
     if float.order == nil then

tests/docs/smoke-all/2024/07/23/10358.qmd

@@ -0,0 +1,24 @@
+---
+title: "Minimal example"
+format: gfm
+keep-md: true
+---
+
+
+::: {.cell execution_count=1}
+``` {.python .cell-code}
+import matplotlib.pyplot as plt
+import numpy as np
+
+x = np.linspace(0,1,10)
+y = np.sin(x)
+
+plt.plot(x,y)
+```
+
+::: {.cell-output .cell-output-display}
+![](10358_files/figure-commonmark/fig-sin-output-1.png){#fig-sin}
+:::
+:::
+
+