Improve error handling for undefined values emitted by map functions. Closes COUCHDB-83.
Improve error handling for undefined values emitted by map functions. Closes COUCHDB-83.

git-svn-id: f1325d765b86db8550d2145f7bc93fd34e7a3d5a@670732 13f79535-47bb-0310-9956-ffa450edef68

apache/couchdb-futon,apache/couchdb-futon