[NTG-context] Buffers and commands with optional arguments

[Hans Hagen]

Wolfgang Schuster wrote:
> Hi Hans,
> 
> I got yesterday a bug report for my letter module if the \startletter
> command takes no arguments.
> 
> The following example show the problem without the module.
> 
> \def\startletter
>   {\dosingleempty\dostartletter}
> 
> \def\dostartletter[#1]%
>   {\dostartbuffer[letter][startletter][stopletter]}

either use \definebuffer, or do

\def\startletter
   {\bgroup\obeylines\dosingleempty\dostartletter}

\def\dostartletter[#1]%
   {\egroup\dostartbuffer[letter][startletter][stopletter]}



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