[NTG-context] New tabulate features broken under new maths release

[Hans Hagen]

On 7/9/2022 6:45 PM, Bruce Horrocks via ntg-context wrote:
> \starttext
> \starttabulate[|lG{}|lG{}|]
> \NC \showglyphs \setalignmentcharacter{=}111=111 \NC \setalignmentcharacter{=}111=111 \NC\NR
> \stoptabulate
> \stoptext

in node-ali.lmt around 615 add this if test

             if signal then
                 -- maybe also signal
                 third_pass(head,attr,preamble)
             end


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