Leaving code-summary empty

[andrewpbray]

I have been setting code-folding: true for my html doc, but I find the "Code" text next to the toggle triangle to be somewhat distracting (this is for a doc where 95% of readers won't/shouldn't care about the code). I spotted that there's a code-summary option where you can pass it an alternative label like "Click here for code".

When I tried to leave it as an empty string I get:

---
title: "Untitled"
format:
  html:
    code-fold: true
    code-summary: ""
---

Error running filter /Applications/quarto/share/filters/quarto-post/quarto-post.lua:
...cations/quarto/share/filters/quarto-post/quarto-post.lua:1119: attempt to index a nil value (field 'integer index')
stack traceback:
	...cations/quarto/share/filters/quarto-post/quarto-post.lua:2282: in function <...cations/quarto/share/filters/quarto-post/quarto-post.lua:2264>

code-summary: "&nbsp" doesn't do it either - it gets rendered as:

I don't have a good hold on how yaml field values are parsed, but this is surprising behavior since something like title: "" works ok.

[cscheid]

That empty string error is a bug (not that it should necessarily hide it, but at the very least the error should be nicer.)