callouts with no title

[ChristopherBarrington]

I get an error when making a callout without an explicit title. I used the MWE in #1 and removed the title and get the following error:

Error running filter /opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:
/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:3125: attempt to index a nil value (field 'integer index')
stack traceback:
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:10765: in field 'parse'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:389: in function </opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:384>
	[C]: in ?
	[C]: in method 'walk'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:171: in function 'run_emulated_filter'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:449: in local 'callback'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:454: in upvalue 'run_emulated_filter_chain'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:495: in function </opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:476>
stack traceback:
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:171: in function 'run_emulated_filter'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:449: in local 'callback'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:454: in upvalue 'run_emulated_filter_chain'
	/opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:495: in function </opt/miniconda3/envs/r-4.3.1/share/quarto/filters/main.lua:476>

I believe it is the following line and with the below amendment the code works as expected in my case (using the quarto-default callout title).

search-replace/_extensions/search-replace/search-replace.lua

Line 146 in af1e692

call.title = call.title:walk(replace_abbr)

  if call.title then
    call.title = call.title:walk(replace_abbr)
  end

[ute]

Thanks a lot, @ChristopherBarrington ! Sorry, I somehow missed this one out totally. Code is fixed, including callouts with empty bodies, that were also affected.