[NTG-context] attempt to index nil value with bidi math in hbox

[Max Chernoff via ntg-context]

Hi Hans,

This test file:

   \setupdirections[bidi=global,method=one]
   \starttext
   \hbox{$\varepsilon$-TeX}
   \stoptext

gives the following error:

           callback error: 
...ext/tex/texmf-context/tex/context/base/mkxl/typo-duc.lmt:618: attempt to 
index a nil value (local 'before')
   stack traceback:
           ...ext/tex/texmf-context/tex/context/base/mkxl/typo-duc.lmt:618: in 
upvalue 'resolve_weak'
           ...ext/tex/texmf-context/tex/context/base/mkxl/typo-duc.lmt:781: in 
upvalue 'resolve_levels'
           ...ext/tex/texmf-context/tex/context/base/mkxl/typo-duc.lmt:1053: in 
local 'handler'
           ...ext/tex/texmf-context/tex/context/base/mkxl/typo-dir.lmt:182: in 
upvalue 'typesetters_directions_handler'
           [string "local tonut  = nodes.tonut..."]:20: in function <[string 
"local tonut  = nodes.tonut..."]:13>
           (...tail calls...)
   
Running either this:

   \starttext
   \hbox{$\varepsilon$-TeX}
   \stoptext

or this:

   \setupdirections[bidi=global,method=one]
   \starttext
   \hbox{$\varepsilon$TeX}
   \stoptext
   
works as expected, without any errors.

Thanks,
-- Max
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