Bad `code-annotations` behaviour when no "list" annotation is provided

[mcanouil]

Bug description

While checking #6297 I noticed a bad behaviour of the code annotation feature when the annotation comment is added to the code cell without the associated list annotation.

CC. @cderv

Steps to reproduce

---
format: html
---

```{r}
stats::rnorm(2) # <1>
```

Expected behaviour

If no list is provided just below the code cell, annotation should not exist and the code cell should behave as if code-annotations: false.

See https://github.com/mcanouil/quarto--code-link--code-annotations.

Actual behavior

The code cell (source and output) is completely removed.

[cderv]

Note that this happens only when there is really no content below the code cells; If there is content (but still not a list annotation), the cell source and results is not removed.

---
format: html
---

```{r}
stats::rnorm(2) # <1>
```

Content

[cderv]

Ok this is really that the problem. When there is no block after the executable code block, then we don't add to the outputs we save to return in allOutputs()

@dragonstyle here my digging

We do process annotations for executable code cells but we store in pendingCodeCell

quarto-cli/src/resources/filters/quarto-pre/code-annotation.lua

Lines 380 to 383 in 907d4c2

	if processedAnnotation then
	-- we found annotations, so hand onto this cell
	pendingCodeCell = resolvedBlock
	else

we don't add it to outputBlock() , so after the above, as we don't have any other blocks we don't go to

quarto-cli/src/resources/filters/quarto-pre/code-annotation.lua

Lines 502 to 504 in 907d4c2

	else
	outputBlockClearPending(block)
	end

and we directly return

quarto-cli/src/resources/filters/quarto-pre/code-annotation.lua

Line 506 in 907d4c2

return allOutputs()

but outputs is still empty

I'll do a PR with an idea to fix, but please to change it if I did not get it right.