deleting a _config key sets the value to ""
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                 Key: COUCHDB-355
                 URL: https://issues.apache.org/jira/browse/COUCHDB-355
             Project: CouchDB
          Issue Type: Bug
          Components: Database Core
    Affects Versions: 0.9
            Reporter: Adam Kocoloski


couch_config:delete/2 is implemented as

delete(Section, Key) ->
    set(Section, Key, "").

I think that's misleading -- a key with an empty value is not the same as no 
key at all.  Consider the case of an update_notification process.  To me, 
deleting that key should just send an EOF to the process.  Instead Couch sends 
the EOF and then tries to spawn an os_process to execute "".  The end result is 
the same, but a few things crash along the way.

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