[ESS] wrong type argument: processp nil

[Stephen Eglen]

 > It's emacs 20.7.1, which I'm pretty sure is the same version as before.
 > 
 > I don't get a backtrace buffer with either the single or double hyphen
 > version of debug-init.
 > 
 > I did forget to mention that either way I do get to specify a starting data
 > directory.

hi Matthew,

first off, 20.7 may be getting a little old, but since our
"requirements" page lists 20.7, we should try to fix this if we can,
but not at the expense of newer versions.

Can you follow the advice in the help manual (below).  esp the bit
about setting debug-on-error to t



Thanks, Stephen.  

----------------------------------------------------------------------
Reporting Bugs
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   Please send bug reports, suggestions etc. to

   <ESS-bugs at stat.math.ethz.ch>

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   If Emacs reports an error, backtraces can help us debug the problem.
Type "M-x set-variable RET debug-on-error RET t RET".  Then run the
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