bug#10864: kill output buffer on "no match"

[Sam Steingold]

In GNU Emacs 24.0.93.3 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2012-02-20 on t520sds
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
Configured using:
 `configure '--with-wide-int''

it would be nice if commands like grep, rgrep, find-dired et al killed
their output buffers when the search returned no matches, at least as an
option.


-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 11.10 (oneiric) X 11.0.11004000
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