[NTG-context] prevent error page

[Johann Birnick]

Hi there,

in my setup I constantly have a pdf viewer open showing the output of context.
When I recompile the viewer updates.

Now if there is an error, the document fails to compile, of course. Previously
the pdf file just remainded untouched, nice. But now with LMTX, the pdf will be
overwritten with a pdf just saying "error". This makes my pdf viewer crash!
I can't work like this.

So how to prevent this "error" page and just let context remain the pdf
untouched if there is an error?

Best regards,
Johann