[ESS-bugs] New?: Rd preview mode --> "l" for ess-eval-line-.. FAILS

[Martin Maechler]

I think this bug is quite new.

In an *.Rd file (with \examples{}!), 
use  C-c C-p to go to Rd preview mode
then go to the examples section  ("s e" is sufficient for that)
and try to send lines to R using 'l'.

It is still correctly bound

  l runs the command ess-eval-line-and-step, which is an interactive compiled
  Lisp function in `ess-inf.el'.

but now gives ominuous error
   "Wrong type argument: stringp, nil"
and *Messages* shows that it happened inside
    (ess-start-process-specific .)

No further debugging yet.
Martin