[NTG-context] Description together with itemize, luametatex

[Gerion Entrup]

Hi,

I'm trying to use a description environment in conjunction with an
itemize with the latest luametatex. Is this supposed to work?

Here is an MWE:
```
\definedescription[desc][headstyle=bold]

\starttext
Foo

\desc{Some title} Some text
	\startitemize
		\item Some item
	\stopitemize

\stoptext
```

This currently fails with:
```
resolvers       | formats | executing runner 'run luametatex format': /home/gerion/context/tex/texmf-linux-64/bin/luametatex --jobname="./test.tex" --fmt=/home/gerion/context/tex/texmf-cache/luametatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt --lua=/home/gerion/context/tex/texmf-cache/luametatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui  --c:currentrun=1 --c:fulljobname="./test.tex" --c:input="./test.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:texmfbinpath="/home/gerion/context/tex/texmf-linux-64/bin"
system          >
system          > ConTeXt  ver: 2023.02.23 21:26 LMTX  fmt: 2023.3.4  int: english/english
system          >
system          > 'cont-new.mkxl' loaded
open source     > level 1, order 1, name '/home/gerion/context/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system          > beware: some patches loaded from cont-new.mkiv
close source    > level 1, order 1, name '/home/gerion/context/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system          > files > jobname './test', input './test.tex', result './test'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > level 1, order 2, name './test.tex'
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern rm 12pt' is loaded
lua error       > lua error on line 8 in file ./test.tex:

registered function call [809]: ...ext/tex/texmf-context/tex/context/base/mkiv/strc-num.lua:448: attempt to index a nil value (local 'd')
stack traceback:
	...ext/tex/texmf-context/tex/context/base/mkiv/strc-num.lua:448: in function <...ext/tex/texmf-context/tex/context/base/mkiv/strc-num.lua:442>
	(...tail calls...)
 1     \definedescription[desc][headstyle=bold]
 2
 3     \starttext
 4     Foo
 5
 6     \desc{Some title} Some text
 7     	\startitemize
 8 >>  		\item Some item
 9     	\stopitemize
10
11     \stoptext
12
mtx-context     | fatal error: return code: 1
```

Best,
Gerion
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